Malicious PDF — malware analysis report

Static analysis result for SHA-256 f816a0c40b48f9dd…

MALICIOUS

PDF

89.7 KB Created: 2021-07-28 01:42:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7f6cc0bbc37c6bafe742395be01d627f SHA-1: b4e459b3c261bde6916dcdc64c72071e1c7026a5 SHA-256: f816a0c40b48f9dd58eb07c36fa06b3ab0a71b9c29b5026177c8dde1a276b36a
244 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File Execution: User Execution T1566.001 Phishing: Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious. It employs social engineering tactics, specifically instructing the user to copy and paste content into a terminal, which is a common lure for executing malicious commands. The document also contains numerous links to external PDF files hosted on compromised websites, suggesting a potential phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607671973ee5c---3173216614.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cb3810dddfd---60164800281.pdf
    • http://erdivigado.hu/userkepek/file/41995315832.pdf
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/97673047825.pdf
    • http://ibconsulting.it/userfiles/files/rakutenojaguniwabiw.pdf
    • http://thecobbfr.com/clients/4/43/4363d5a08aa72aedcf7f7d4dd0675897/File/bubesuvotubitavit.pdf
    • http://partnercable.hu/files/raloripopifusegado.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/c14095b3a355d4c33a277297211c4a4a/60283357594.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f533b1ade1---50913442895.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160955742150b9---57090079163.pdf
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/225948466df638a620110c8658db460d/96048663966.pdf
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/su552mfr7fr80sf4thdh3ugpkf/nojone.pdf
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/fd82875c966d62555b5cc7aa036c021c/12087961169.pdf
    • http://klasykarozrywki.pl/public/images/fck/file/4955493810.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fa967e03a86---vixumiferozemeno.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160c593b4d045e---46478248569.pdf
    • http://rentaruedas.com/files/others/lejeborotilozul.pdf
    • http://artospace.com/pics/file/55416942879.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb92f643dcb---juxuwazizodiv.pdf
    • https://jodhpurtravels.com/nbloom/fckuploads/file/foluniruxejilotawejutuz.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/6d9e86a1e8a9c41edef25b7831566a2b/21723714144.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9e55c94f12be4cc0a4326648135739ac/bupizonomukemovomegevixe.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=can+you+use+mods+on+sims+4+legacy+edition
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f660.bin
b4c388fbfac3d1d5288b1bb88c14e9f1b0a5863fba7da45c3365955a9a295782
pdf-font-stream PDF embedded font (sfnt) at offset 0xF660 18336 bytes
font_01_sfnt_off00012675.bin
b459c106c12aa495c40ddc80e70f0e5b453783635474ea850ded72f0c224e747
pdf-font-stream PDF embedded font (sfnt) at offset 0x12675 10936 bytes
font_02_sfnt_off00013faa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FAA 16792 bytes