Malicious PDF — malware analysis report

Static analysis result for SHA-256 842177c9a6cc7932…

MALICIOUS

PDF

98.6 KB Created: 2021-07-21 04:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0b3150309c864e943ffdf60155310c0e SHA-1: 094169e32d332a453cb3a4e33cb8192b5c639890 SHA-256: 842177c9a6cc7932186c59f645fc2e82a69677df9a0643494cf294942269c16c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the PDF acting as a link farm, with many URLs hosted on compromised WordPress sites. The primary purpose appears to be directing users to potentially malicious or phishing content through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9898

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://gintaras.cz/userfiles/file/jupulikevetuniliwure.pdf In PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/3f20c78aeeaef9974b2cf5b3cdbf940d/ruvegugalofotukugup.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/12650398009.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a310dea9276---56209726054.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/oc4cp9q49itu91tbp5uu8mok8g/37358021632.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/3915caf002c4317fa29bb6e3d04a04c9/kezuzaluzonot.pdfIn PDF document text
    • https://okazionche.com/files/34163329938.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/xerube.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/38886539795.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/jepijadawubupugef.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/bulisaloxabokopoterojogo.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/78604108173.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/tagiditudivewoxibitovof.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/xirokiker.pdfIn PDF document text
    • https://ayurmitra.com/files/file/99960533805.pdfIn PDF document text
    • https://thehero88vip.com/ckfinder/images_store/files/50743806666.pdfIn PDF document text
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724a2d52306---16534081729.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e61ee4061---19664922172.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/fll0hgsjffnq4j64f3t5l38r74/6535074551.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607446280ff57---40851954314.pdfIn PDF document text
    • https://everestart.com/images/stories/file/93424573356.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/a3c5335e0b3a02db6aa3afb23f5606c0/8919128218.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/wafovi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=mary+butler+hadid+picturesPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001025c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A73 10732 bytes
SHA-256: 3586445ce73958f862d797c933105806d3b2969c20f396b910026b0f7c33b88e
font_02_sfnt_off00013307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13307 19956 bytes
SHA-256: e7bc0e1d0cf529994adeea2e4a6c265fff131909473b0393187d5fdbbcc2c269
font_03_sfnt_off0001637f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1637F 16740 bytes
SHA-256: 2e2c23b23fd7224d831d751eedd507937b8cdff7931efd827febe20278afe9dd

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