Malicious PDF — malware analysis report

Static analysis result for SHA-256 bee1991cb634f62f…

MALICIOUS

PDF

82.8 KB Created: 2021-09-15 23:59:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0ecd7709f904212266aedbd9d46c1400 SHA-1: 43b244b2a236ff50c51c671b56a4523592fa3cf4 SHA-256: bee1991cb634f62f0157b261219fee13d22e112f3ae2230e992c2ed2c70535e7
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous links pointing to external resources, many of which are hosted on compromised WordPress sites or disposable domains. These links likely serve to redirect the user to download and execute a second-stage payload, as indicated by the 'PDF_RANDOM_URL_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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 https://queure.ru/uplcv?utm_term=led+22+inch+price+in+pakistan PDF link annotation
    • https://divetechmarine.com/contents/files/nesejirajixo.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/sazojawifuporuwimug.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/38765534047.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/27519672266.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612eae427f25b---leriloxinagulibi.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/nevajesesanakumajax.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/fe449d88ee8459028d481cc8ab4bdf6a/9827157532.pdfIn PDF document text
    • http://wirheiraten.de/images/file/jibiganep.pdfIn PDF document text
    • http://wine-paraphernalia.com/files/winep/_repo/file/vejelu.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/27593640078.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/bofonadibuseguseribo.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/mibukotujixozifowil.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/48600770991.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/naroronew.pdfIn PDF document text
    • http://carszana.com/image/upload/File/35532210348.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/vifojab.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/labeganebuxodisupibobusiz.pdfIn PDF document text
    • https://hensuyenpqa.traigiongthuha.com/ckfinder/userfiles/files/72854419871.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/tirokalatu.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/7d82fe7d6f4a5c1cc82c7bd02752704e/21008607135.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/goxelemeru.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138891f22725---galazadafizolubad.pdfIn PDF document text
    • 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_off0000de6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6A 17936 bytes
SHA-256: 4467111e72503b8fb6bf6d28f7031f1bf2aae0451d61b0ffc83bd86abe6cbc93
font_01_sfnt_off00010d48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001255f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1255F 10616 bytes
SHA-256: 3e653914a1432ef7f99edbb9da094063e3115535b0d76b5fe0b9516f2afc086f

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