Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0fe4980352b9d27…

MALICIOUS

PDF

99.4 KB Created: 2021-06-28 08:48:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0a5afc325b0bcba53e9201ad5c2c13cb SHA-1: ca37803e87b1954eafbe7609a1d1a627af246103 SHA-256: a0fe4980352b9d273e28e08d25adb6f00437d732a48a35009f93e0e214838b52
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, pointing to numerous compromised CMS upload locations and disposable hosting sites. This suggests the PDF is used to redirect users to potentially malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9784

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//15973730205.pdf In PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f53af3bc81---xemafajiliru.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/67503961800.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b60ea72287---8056815891.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/bigemulazazipizibu.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/j3bn0omg71mvoc2t0157doeukq/86158899016.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/a3199d985b9ce0c752cf04d3319510b2/tifarexoxufelozes.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/39212626293.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160787964af14b---bovilatovalebulosugozak.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b30816e4280---10739510600.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c80313252e---nilimexonapolesifevuwasep.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/dfe642dae4a209b750df83cc5d2b88e0/mukusijo.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/10883498396.pdfIn PDF document text
    • https://avenue102.com/uploads/file/15706646058.pdfIn PDF document text
    • http://amtutoring.com/clients/865321/File/zatilul.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e70737cd1---rijitexigunozabasa.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4905d22b7---73028239535.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a412907287---82441839845.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/50523112749.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/zitapitap.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/junijirilinupu.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210517135345.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/33132788156.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a1244e871---dakegoveta.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b9362d964---dokaki.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b7677671140---nasebepidimorufigimur.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/b04628ff01cdcfcbed61f150069aea5c/97156358601.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=transformer+collection+tamil+dubbedPDF 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_off00011880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11880 20560 bytes
SHA-256: 53f724dbdf265540d2cb53ae04b5e7d15a5b2482b3e4e757f7e39ce23d6296dd
font_01_sfnt_off00014d4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D4B 10840 bytes
SHA-256: cec98f5bd76695645f566ddad92c247ab58a109c27ed996da9cc2f49a6007b13
font_02_sfnt_off0001664a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1664A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1