Malicious PDF — malware analysis report

Static analysis result for SHA-256 0739a33d3b35f269…

MALICIOUS

PDF

96.3 KB Created: 2021-07-23 22:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7ddf1f2978df3234a4cf5e8b918e4f96 SHA-1: c71bb732b0d45bb08f8db565740929ea4e177664 SHA-256: 0739a33d3b35f2690caf064f4d7a15012b8fb07819ef1352ee9a83506d88867f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a link farm hosted on compromised CMS uploads. The presence of multiple links to PDFs on various domains suggests an attempt to distribute malicious content through a deceptive interface. While no scripts were directly extracted, the overall structure and heuristic firings indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://tractorpulling-emmeloord.nl/upload/file/xedoferuzitimovera.pdf In PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/84842404768.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe02eda8bd---goditaguguxovorumuwudaxex.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1e777f04f---wegudad.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/90032863423.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d24703ea9---86727873455.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/werozokotumuniw.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/wikexidedatifasozuwavusim.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/4c01851ee5f1024f0382eb752bc055e6/85907745748.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/d542db31744f058aa959ebd8075672c5/73079012948.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/f62g93tgkvrajdgenksm6ohbd0/44437601918.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/jevij.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/20269842784.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/ccc31f10aa66ac1d123c0cfa7c102aaa/85115289281.pdfIn PDF document text
    • https://ratsimae.eemedia/contents/file/80913288559.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/3mhvcdsrsv2gr3t6i2dtcueoo1/14251445552.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/1a435685e11bc2607c1b300ab747044c/29287561698.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/31567263247.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a92b7d1c69e---xifokalamefozadujof.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10263751800.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16086471089fe1---buvomasatubinag.pdfIn PDF document text
    • https://chauphongasia.com/wp-content/plugins/super-forms/uploads/php/files/11elsl90ao8dqe3rnq6hil3pig/56736264120.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=manual+extensor+repetidor+tp+link+tl+wa850re+300mbps+2+antenasPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67F 18260 bytes
SHA-256: 4e220bf1005b8f65358f0bebfd957dcb4efae885b3ea4ee3f332f16edd671ee6
font_01_sfnt_off000125c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013dd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD4 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_03_sfnt_off00015351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15351 11820 bytes
SHA-256: e357c8f2953d5c43b79728585b76aec2046c54e44ac5b65f921e4c22408e0642

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