Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b565a5dd684b70a…

MALICIOUS

PDF

137.9 KB Created: 2021-07-03 07:47:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b98ef9273c91e7eb443ca9faac2afbda SHA-1: a4ecdd27e7ed7304ddd637674e6abe0256adeb63 SHA-256: 7b565a5dd684b70a1eb06b572c1a793c3b77030125669505402c68894602ae4f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the link farm heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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 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://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e3bf1201a---nunutuk.pdf In PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/xofomuwufevim.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/badalivub.pdfIn PDF document text
    • http://ahchala.com/img/file/kumisowipopowuwofisupepu.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/e985b80a751f84d23d8e7951b1a250fd/6815376082.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/cd2105c83f29b90e611f630542d68150/94242088763.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/5d0a6ppk0246fggbn7h8nsn790/vusanasibibebegu.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/botumapof.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/xovanezido.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/18954229468.pdfIn PDF document text
    • https://belloverde.net/emailer/file/zilovux.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/19l9p5mlj59ep308svj4ir9cq7/resutugote.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/035633ba5af23eb4b17eadd33a9d9174/48868820354.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/pesezoluduj.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/46053247624.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/beb27bd69152c785de2b1f9e104fafcd/79170885457.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/39235308824.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd9542e2ce---visel.pdfIn PDF document text
    • https://club-sports.net/uploads/products/files/31641725383.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/f965c4ee47049fc3c0f23e51cad70d33/fivitexolotekeduvan.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16088a34b88367---xamabijafaronogebus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=to+convert+ammonia+into+urea+the+liver+cells+requirePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B3AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001cbbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CBBE 20272 bytes
SHA-256: 5f5ce7eadf396ea135a15bd163453fb9cf18c78281720cf74f7f8654190f84fb
font_02_sfnt_off000200fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x200FC 10772 bytes
SHA-256: ae70c94c7878f9f6c996c5f139b0ef61da82fd44be9dcafb179c14157ed73b0a

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