Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa687e211c590ef6…

MALICIOUS

PDF

83.0 KB Created: 2021-09-04 17:51:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bbdd473f28ed4475596d99b378a0127b SHA-1: b7e9104032dadad1b309a62437402a5fd393a47a SHA-256: aa687e211c590ef65b0b0ba99c54642381311086ad6cb9a874da5667ab75bcaa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The primary attack pattern involves luring users through a malicious attachment to a site that then redirects them further.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/r4etna67l588loqsiesmej5gd4/78921763631.pdf In PDF document text
    • http://3qlohas.com/CKEdit/upload/files/32011162239.pdfIn PDF document text
    • https://irrisyst.eu/files/file/labomakuro.pdfIn PDF document text
    • https://fasleh.net/Files/files/54856941038.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a916ad619---64655251665.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/fozeguremujavobusib.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c88a767b7a6---89875131169.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/fufuwaxomolisonasif.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/80170279893.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a308f14f9---40994940273.pdfIn PDF document text
    • http://karthikeyanjayaram.in/userfiles/file/26371754594.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/161258efee1810---68650669907.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/99d179e56ee3c3a9bb434525c77ac08c/segowodu.pdfIn PDF document text
    • http://harrisonfamilyreunion.org/clients/868801/File/duronovekofuvewiju.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/21148005174.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f655f333f8c---mosofix.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/rekulasiwufe.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/7kchn6iljifd6jinaefg1r2vl3/40031587607.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/sojawuzekixazif.pdfIn PDF document text
    • http://thepnguyentran.vn/media/ftp/file/75806721889.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9d9ac0dcf---46226971301.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/8553c169085690b0f675eadd970e7a27/nigewone.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/50443824347.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/4569715079.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=kaeser+cs+121+air+compressor+manualPDF 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_off0000e0ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EE 10700 bytes
SHA-256: cb7da0a78b2c417bdb67fb09e383d547d2f33ccc57b2e1e1f7767ace358df847
font_01_sfnt_off0000f98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98A 17376 bytes
SHA-256: 09c12be8d74ab545f2ccfe961cfc1818c27a56d896f87b6f65641824aae092d7
font_02_sfnt_off00012629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12629 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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