Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bb5501c02880d30…

MALICIOUS

PDF

87.3 KB Created: 2021-06-26 06:13:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4cf1491ecc75acb62b63bf374540f785 SHA-1: e1e10ed87c5bf575daba5641989b52af8f9ff37b SHA-256: 9bb5501c02880d308bcb4aafc21cdd1134afb88a8f9cda8771a80b3e531542a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm pointing to multiple compromised WordPress sites, likely intended to host malicious content or redirect users to phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, with the document acting as a lure to external, potentially compromised, resources. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/oh6qpftvb635ng6mjmcdbjm6da/70726046006.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/kibtp418a75u833v332j7n2qt4/4565588718.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0cb9f8962f---wudovodezorowo.pdf
    • http://nw-line.ru/generic/uploaded/zabusatefoledusajew.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/4bd52f24809ca9614e5f7eec331b5754/sadelasezimodajaz.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b26b844b730---43286781579.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c701145025e---masibodexaleguvabiletokew.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/pq54u77tj1qoftqnq9i5hvfd3m/47407139562.pdf
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/742bf76e7f43fad6c7af3075a0ae990c/35981937961.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/pfblfj1o703bo58bmsq0e676ue/xatovog.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160b356ce5c43f---94913637477.pdf
    • http://12shio5.com/contents//files/41904435714.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/2b407659fef514201ced34f3c52edaa1/95482499111.pdf
    • http://oreade-breche.fr/userfiles/file/90250536795.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160884fc1dc007---52968882456.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/4164f90aaf2841434a4d1890537e635d/pafivuxajiv.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16075a75b2377c---sinet.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/c331b9adbb3384d641a14da6ca2b0fb1/bafufipazigozodet.pdf
    • http://abwrva.com/uploads/files/32228724603.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/92l35cpi6vg61i18a1oc99hrga/rawikawo.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc19e41980b---lejumasemafubetovin.pdf
    • https://aawyx.com/sites/default/imageuser/file/kijodiwomuzogeg.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098713fac4cd---vavafomekotirugivurulux.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/qcpnd04bndoei3kif8l9f92rck/57750061441.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=c+dictionary+words
    • 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_off0000f2cd.bin
d0fddda8fbd7268ecbcd2863a774ce68a2a612e5184e088a2199512e99ab1a11
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CD 10416 bytes
font_01_sfnt_off00010aa0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA0 16792 bytes
font_02_sfnt_off000122b2.bin
37ce1ee2748fc1d140e5fe208f7677bb7cee764b25ff2036fa1ba572aa68bdc8
pdf-font-stream PDF embedded font (sfnt) at offset 0x122B2 17476 bytes