Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aa6f3fb066cd578…

MALICIOUS

PDF

85.1 KB Created: 2021-07-20 03:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 259c8707a86f62af72ab386baf1bc37c SHA-1: 07cef6f4c04d61eb78e887b24dd59dd4a6924a6f SHA-256: 2aa6f3fb066cd578f59ab72a725ba3a170d7ec83a8747f3766c4296225dc6087
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and other domains that appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution via these links. The document body is unreadable, but the heuristic findings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d80cf024d---55571887273.pdf
    • http://premsaktidal.in/userfiles/file/7350652290.pdf
    • http://akvatoria.by/UserFiles/files/83944264259.pdf
    • https://trvstore.com/userfiles/file/tupinitedasotobab.pdf
    • https://luminex.pl/upload/file/navafulezoworugate.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f23779a47e---89278215617.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075dba7e09d7---bovixul.pdf
    • http://bpsstudio.hu/uploads/7165514017.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/50blqmjvqvj199sd1b4htahho7/825935983.pdf
    • http://aggengr.com/uploads/CMS/file/12743511765.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/27174q0fhrfi786bqsag135it7/rovewazebogonalavewopuj.pdf
    • http://apexibd.com/uploads/fck_uploads/file/luxilunurokuxeka.pdf
    • https://ikansambel.com/contents//files/7997535664.pdf
    • http://sl-light.ru/design/img/upload/file/jebaxunefekabovakod.pdf
    • http://komputerzagrosze.pl/userfiles/file/nesudilovebidosef.pdf
    • http://zabradli-znerezu.cz/userfiles/file/1349250156.pdf
    • http://alarmy-kamery24.pl/userfiles/file/2334567597.pdf
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/ac650ac24419af78a5c324078e2fdb47/jazitokadadu.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16096517bd3104---95947851594.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/4g182i9rs5un0jqsc5lqvpmu97/nexef.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/6mhk1nv72tsutcicg22hc48e5m/19873392328.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ad2b09363---95839151755.pdf
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/f463828c7bcc9772883e2d46dfbb7d8f/xedut.pdf
    • https://xn--pssa17sw71b.tw/upimages/files/167889754.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=photo+grid+video+editor+online+free
    • 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_off0000eb94.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB94 16792 bytes
font_01_sfnt_off000103ab.bin
d6b57fb2f3d907b9bf5ca54dda55f07ffbcd514ac6c1d0f704409457c379d4e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x103AB 10368 bytes
font_02_sfnt_off00011acf.bin
ab096bdf896e1695c17c0eec3c67bd478ce533f2729dc811bee82fc718a13bc3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACF 17000 bytes