Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfdf630ce14ec064…

MALICIOUS

PDF

116.5 KB Created: 2021-10-03 14:00:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a3202ca5f83ef77ef4fc844f724980e8 SHA-1: 4815a8c2dab0afe6f18f7c9f5287723bd0aa0fc3 SHA-256: dfdf630ce14ec064997a0a56b26fc5bb11c054fd4c2bb1af14fce3017586667f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to potentially compromised domains, and includes a callback lure consistent with tech-support scams or billing fraud. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it is designed to lead the user to malicious content or solicit a fraudulent callback.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://russia-ex.com/images/blog/file/nojawulaxokebime.pdf In PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16158b03870ba8---viwebivamezazepupazide.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/24484311169.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/86815731257.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/34692660709.pdfIn PDF document text
    • https://laps.pl/userfiles/file/97679217652.pdfIn PDF document text
    • http://grimastone.ru/files/41156070544.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/3332599236.pdfIn PDF document text
    • http://www.angels-rest.es/ckfinder/userfiles/files/31687394403.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16158d41503722---xutaporewemekeporasu.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/resikopatabewen.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/25163591190.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210908_F84C921810A54913.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/39030198406.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/2822fbe140d498e7984832015ce36d69/ponoxepuwojawanodub.pdfIn PDF document text
    • https://ratoempat.com/contents/files/12687957437.pdfIn PDF document text
    • https://remini.hu/userfiles/file/sikaponefatoro.pdfIn PDF document text
    • https://nexapos.com/upload/files/28745757186.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/sober.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158a6a253723---sedilo.pdfIn PDF document text
    • https://miraclechuppahs.com/userfiles/file/23662185209.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/62955048970.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/35741586251.pdfIn PDF document text
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/vefavaselodolumu.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/35004521696.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=pig+in+the+house+organic+shiraz+2018PDF 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_off000152f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152F0 11128 bytes
SHA-256: fa10871790316ceb364ce570ad5088e66cb5a741c4f515fbfaf764b7e55ca1c2
font_01_sfnt_off00016d09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001851b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1851B 23152 bytes
SHA-256: fa5b626f913e0c60ea0c6f5a8fa11ddec682c1a11e8174b64cb04b54769d4f9d

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