Malicious PDF — malware analysis report

Static analysis result for SHA-256 0672257392a7f2a5…

MALICIOUS

PDF

83.3 KB Created: 2021-09-02 03:30:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: f332ca45838916a3a81d27cbb7e2874a SHA-1: 13e6b36f485103baade32d0d042fab5553962373 SHA-256: 0672257392a7f2a52203949bf7fc3e28dbe7027052de7b19fb437d27abb93e4e
236 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a ClickFix paste-and-run lure and a clipboard-command (paste-and-run) lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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 https://fullmagicweekend.com/ckfinder/userfiles/files/31679423395.pdf In PDF document text
    • https://hanyauntuktesting.com/contents/files/89039175396.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/valadivejul.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/dixusamebobi.pdfIn PDF document text
    • https://carlojans.com/cms/file/pidewimerem.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9bfe9862f---kupuwesawebuj.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/95798995094.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/kimurajukawano.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/b2dece37bd4a514ed2e699cca619d263/rosakegigimo.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/9ff17129de3fd6176ef8befb4aef6e77/xuramazowelawa.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210822095933.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/zusilipaletibavu.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/dcbvfseq9l6mgcmt9omaod73c7/niwolanemunonasonomezinod.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/kibovofinede.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/sesadiwalejafamabosonib.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e7e49ccca11---44264775470.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/ralij.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16121bd49cba45---21081945734.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/mumuliwoxejolonute.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd782d1b0a---75791943761.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/vegodupogokefarinoga.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210630011529_1159574868.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+disable+keyboard+shortcuts+windows+10PDF 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_off0000ddcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCC 11164 bytes
SHA-256: fd5abf439e323b09afe5665b397d749113bbc60a2f8b155771709784aa63731c
font_01_sfnt_off0000f7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E7 18564 bytes
SHA-256: 03d60092c76be13afb94351dbbd3696c5fb48af966a2e7260bc852b08035b938
font_02_sfnt_off000126f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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