Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b3a03387c2cf0f6…

MALICIOUS

PDF

87.1 KB Created: 2021-07-04 03:33:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4a4cc527e4b62098c0481a19e2623537 SHA-1: 7cfc0f10394ae50bce37d8a868dbbe8d80f9246f SHA-256: 8b3a03387c2cf0f66396d9002234ac688f02c76aa11cef8b322cf6026f4aded3
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely serving as a distribution point for further malicious content. While no scripts were explicitly extracted, the nature of PDF link farms often involves embedded JavaScript to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f601c1bea13f51dbe5a3ed7a5b0a7df4/joripofabavu.pdf In PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf84585b73---10238395047.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/dd477b71244683cb0403f74e1c682912/8949845484.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/nas1b6kmqjipfmh9ke8pn3tpoi/5545786803.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/8rh8dfl1luth0sl1al57hctiut/46443810257.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/a3glk98a57h9op1vl047rim6jr/49818516445.pdfIn PDF document text
    • https://strechybenesov.cz/content/49607781187.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/kiramo.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/bilefajurovuxifimipaj.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/kdqdnbvvn0eona29f6vvilpr7d/sotanunumap.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/c7d703d844dd48b1dbe84686f6f5b69b/sovasubisinitu.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/bepiruridipidixugaxi.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/a7631c32fe57c7be866124036577910e/tavafifotu.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/70496620977.pdfIn PDF document text
    • https://cheesykeju.com/contents//files/mugudebifaf.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/bc5ba1811df083207e0bafe6ec5d6c7f/60616984799.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/3317912037.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d6cc7994a31---60300131268.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/jddl851lrdk59and72u3jt00l1/belatagaxeronamubevusux.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/cd3f23c866f1f1774204a110dcd82410/zesoxipixibovumaxitixeb.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/36561765813.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/wolopofimefugov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=8+pool+hack+unlimited+coinsPDF 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_off0000f166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF166 16932 bytes
SHA-256: d80384a6943768aefd018ade355d878e9b60848d2711817d837d819ff049dc84
font_01_sfnt_off00011df7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF7 10984 bytes
SHA-256: 3d6924b7d7660f2b9fd6727fc077c7ee499a3b6b3934b1949c6f563ad30d877b
font_02_sfnt_off00013748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13748 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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