Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd0dcfabc6a9bdf7…

MALICIOUS

PDF

84.0 KB Created: 2021-09-04 08:11:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 56471bba02462f8a4d957996cacb420a SHA-1: 4e1e8c7a439e39d5b1f428548c1a83b4c30488ad SHA-256: dd0dcfabc6a9bdf7bc7ef1e3b1c9a75050c6b929d07f9c18e4b4753f4b8f8092
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF contains embedded JavaScript and numerous links to external URLs, many of which point to compromised websites or IP addresses. The embedded JavaScript and the nature of the linked URLs suggest an attempt to download and execute a second-stage payload or redirect the user to a malicious site, consistent with phishing or malware distribution tactics. The ClamAV detection and ML classifier further support its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://127.0.0.1/bantraicay/js/ckfinder/userfiles/files/fewifegipuluzazepowidopul.pdf PDF link annotation
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612467f2d598b---kokozukajevafetupa.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/16727980767.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/521db3627cdd2f05b562e056d73eaf0a/mupemikirerixivagajewiz.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/mojagesagala.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/7hf1ka47j383bn2nc00fo2ek53/tinitizumirovotidijiw.pdfIn PDF document text
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/zagonanaz.pdfIn PDF document text
    • https://kamedia.vn/data/file/nukazuvofiviwi.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/faxoribadijijovisoxip.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/57d2ef878c456fd4fc1f054794cb6d00/galimu.pdfIn PDF document text
    • https://peperita.it/writable/public/userfiles/file/pedagivezolubegawowumos.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed54aa0c3d---56905197156.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f74e56ed19---60633587958.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/kisomek.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/11000294719.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/e2hvkv47lfqdqj2q1m477vp8cq/wotawomewinazenasowi.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd12b9eff22---lulezajonobulugivuje.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/28246745948.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/bozezoma.pdfIn PDF document text
    • http://alexsrmenchion.com/clients/b/bf/bf5401b25fe3457642f5a6f1150d5537/File/nexiraloketexulifawu.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/d1da3d3dd7715a0c020c91b12af66d42/88326438001.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076dc99e9410---fixasijafaset.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/lepiwebugivurarete.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=hands+on+math+activities+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A1 17864 bytes
SHA-256: e3bfbb59e92de487f1ca683ee8ddd8c7426bf872b7afc1351429a3e887947371
font_01_sfnt_off000111cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CF 10796 bytes
SHA-256: b3d723067b49ebfd1e249e768f9aca9ceb55ecc0633809a475896a08c6449c89
font_02_sfnt_off00012a73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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