Malicious PDF — malware analysis report

Static analysis result for SHA-256 56875706cc093e04…

MALICIOUS

PDF

78.5 KB Created: 2021-09-12 02:11:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9b3efbef84047a358bb24cfec0ddd0e5 SHA-1: 1658ab7f6722dcfeda9b0b33ec75b748cded5411 SHA-256: 56875706cc093e04f512e3b79c4daef062f92e8a567bc0c194e101f4fd36569c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. It contains a large number of links, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of multiple compromised CMS upload links further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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 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.
  • 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://dr-onesrl.com/userfiles/files/71373123103.pdf In PDF document text
    • http://dasbluemchen.com/13819468385.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/watinupopefilufedokugadav.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/19909393807.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/19896748915.pdfIn PDF document text
    • http://jar-ted.pl/file/bufalivazenosovaborefu.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/447cf118033953988a5fb6a870f4d3cf/86191258340.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/36517437234.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/82670300066.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/39337447696.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/4030162581e521fef5dd861856e19773/39568396586.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/56230858963.pdfIn PDF document text
    • http://e-menu.hu/editor_up/wuvajesuwivip.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137726dc18e8---wexezarapowaduv.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/52400342054.pdfIn PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/sulibojukiwejadejuv.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/9579277783.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-9-12/20210912070034945486.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210912070510.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/74320798604.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/2828326e85cc5c5ce494315a99e9c4b3/98481967172.pdfIn PDF document text
    • http://svarovani-tig.cz/userfiles/file/20991388459.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/68882221007.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=pixel+3+os+updatePDF 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_off0000d034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD034 10556 bytes
SHA-256: ccc83d3405d3809d4eedc6999226bd2323595f8b5f1232a4700e9ace44ae3724
font_01_sfnt_off0000e875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE875 16960 bytes
SHA-256: e34b45509313eda0043aad80b640987ec91eae02826dbb0e818edc904a1edbc9
font_02_sfnt_off0001145f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1