Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f7db397f0c2ae86…

MALICIOUS

PDF

88.2 KB Created: 2021-07-01 17:58:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 38e76abd93d786d75c98d28d2daabf43 SHA-1: aca4d355a17a88255e4a27aab869c348dde5d38b SHA-256: 7f7db397f0c2ae86af66e2831c375ef772af7278eb523f3aa0253a8f2c95833f
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external links strongly supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.hgbehringer.de/img/files/files/xubir.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/e9e8eb6fae18ffc8abbb6eba13c90b63/neluribavi.pdf
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/9a4f07faf6cd7f55f80b046a92fc40ce/82104696121.pdf
    • http://idealhca.com/admin/images/file/65211792841.pdf
    • http://pelesiuvalymas.lt/i/File/62925221101.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/pq864dehu1q8e65eo5dpqobqsb/bemalenopuseliletu.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4eade176f---lasobuvazezakitisuzeveb.pdf
    • https://melz-feu.ru/upload/62391131641.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b95fc0f86d---tomexadidusikulaxolus.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/db22a691aa6fa3ae59c16aa20f42e7bc/71876704868.pdf
    • http://tamker.hu/userfiles/file/dopogewedunal.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e48b6aeb4---kutakig.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a746efe5494---93654463045.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788a79b85f2---zupifijebelebi.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/02e48f2722711995d9e2d283f30680ab/80295010871.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/0f4bd3f150d9479dc1add8dd2865bc23/39303224645.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/vpmcnqojpoa4j77d05h7e340r0/47910804231.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/dplfchu234rkmnnejk3dme8oi2/deninawexevo.pdf
    • https://all-stage-meditation.tw/uploads/files/60c4f8ed89794.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/5vk6cqf7uociot4ipnd61orna4/34819236510.pdf
    • https://bloomeng.com/uploads/konepit.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dce1914a743---33226747770.pdf
    • http://www.tramag.pl/upload/file/17761053367.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=pixie+bob+with+long+tail
    • 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_off0000f65c.bin
f14e6b681c938bfe1dfc134f4f0ddd6cd69c8ea84baffcb8a52db91926b6ef57
pdf-font-stream PDF embedded font (sfnt) at offset 0xF65C 17420 bytes
font_01_sfnt_off00012421.bin
ed9210c38ddcef68ad23ec1b6f7f85a296ea00b4daee4c61ee73570efbf754fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x12421 10448 bytes
font_02_sfnt_off00013bda.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BDA 16792 bytes