Malicious PDF — malware analysis report

Static analysis result for SHA-256 8db79a90902a8312…

MALICIOUS

PDF

73.8 KB Created: 2021-09-07 10:53:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b7e5afaa9441ad11400fd8e2a50234c1 SHA-1: 0407d03c9a416af9e5b079bb4477da229fb118c1 SHA-256: 8db79a90902a83121ecd2e9e7110f12f7774759280d1fba46d244133e360053c
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress upload directories. Heuristics indicate this is a link farm, likely intended to lure users to malicious sites. ClamAV detection and ML classification confirm its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a683978a43d---pisuxum.pdf In PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/122fea658a4b0f2661d5f0ce84dd35c4/50981772523.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/94541ef2af50007b5cbb9c335a2d88e5/posom.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/1d8b7600f67b613f667f529c022dc184/rurixiwepinusetawuzokun.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/66343972108.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/1598086042.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/29796827483.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/d1e0ee8d65aebfccc8de53b9513e3a8b/wageranezemowovek.pdfIn PDF document text
    • http://amandamaitland.com/images/file/33944936765.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/97936768788.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/deguramuxibokujebiriz.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/sefanibezusoda.pdfIn PDF document text
    • http://musicupclose.com/clients/f/f7/f7c291dfb329fbc33054893077acf627/File/95084319235.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/37725971922.pdfIn PDF document text
    • http://exlluprimebrochure.com/ckupload/files/51506813437.pdfIn PDF document text
    • http://abnicum.com/files/file/netexabeduru.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160782dabd44b7---41501339713.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/d395d266d43d3f903a1a6b75a1972c48/sizitagirusokozukubug.pdfIn PDF document text
    • http://songiadahoaian.com/upload/ck/files/defowivuxazenaloneraj.pdfIn PDF document text
    • http://3q1p.com/upload/file/210708045449992127risrif9muhgv.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c82154586f---detuvikapojuzibelodezor.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e5da6afcc---xesikijo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=connection+words+pdfPDF 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_off0000be8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE8E 16648 bytes
SHA-256: b0f02eb3379eb496e1ffbf54936f0f283dfdedabbaa14d4aa648172c79eba5f2
font_01_sfnt_off0000e94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10161 10520 bytes
SHA-256: 2cf0827a1832113ed918503110796a6085dfbcb155f4c1711c00ac09bce0109d

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