Malicious PDF — malware analysis report

Static analysis result for SHA-256 68d68e5813c9d420…

MALICIOUS

PDF

106.9 KB Created: 2021-09-07 07:31:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 86bd1388174e92b61690c68647008357 SHA-1: ba9d5f40fa4cbd7e3587f443736652f8552adb84 SHA-256: 68d68e5813c9d4204168ad768b8db937bcbbf259a85364a42114384fbbc3c990
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://pixomot.ru/uplcv?utm_term=understanding+the+linux+kernel+pdf+free PDF link annotation
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/p0pi38g35633k4t8su1ne7r056/40331746072.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/2941553011.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/68171068099.pdfIn PDF document text
    • https://adikkedua.com/contents//files/jejumavuzavogezu.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4d3e4561e---juvufivufisul.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/roramoboper.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/jifokowixibemivijizi.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709e412a2fc---nozekig.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/gomavijubomule.pdfIn PDF document text
    • http://checopharma.com/upload/files/56319021922.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f55e7bd5399---fedavazigiza.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/5ea65p8ifebjrosk19c01gf084/notigomezabojabobodokap.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/u3ak2d9tunbn3mqj2397g1ed9d/73351624176.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/478c2a8600cd6aa0f5fa707eded47c9f/94761206121.pdfIn PDF document text
    • http://yjccnc.com/upload/files/79681220797.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/34465682861.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/ltuq4db871fsdtect9i7rf06t9/gugowikolalubebikosekowo.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/ec35d7d7fef988a7d760456a3b091d4d/sutudopig.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/90540768b3fd4f43ab6540d1f59bf05b/wusajupi.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd415e5df1---68351371769.pdfIn PDF document text
    • http://usdcp.jp/user_data/userfiles/files/kosidokusefitef.pdfIn PDF document text
    • http://colokit.thienlonggroup.com/Images_upload/files/7339041532.pdfIn PDF document text
    • 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_off00013bb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB6 18996 bytes
SHA-256: e0db9cfdd6030e79d6fad569831f4cd7efbd9c648bf03dbeaf230ebe37b7c20c
font_01_sfnt_off00016ce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000184fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184FD 10956 bytes
SHA-256: 9529f8bedecef010d3c291d2a56cf953a22821429b542d83d6e098794ac4f6e5

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