Malicious PDF — malware analysis report

Static analysis result for SHA-256 df15fc113f390682…

MALICIOUS

PDF

85.2 KB Created: 2021-06-30 04:12:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9f1fbf57cfe53bc5ada0f03a7521ddc4 SHA-1: aadee3497b7eea4052714cc8e4718084d1d41768 SHA-256: df15fc113f39068278c09d81da12c7654e615e601a12ea7c262e7fb499eeb893
156 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. The document contains numerous external URIs and link farms pointing to compromised CMS uploads and disposable hosting, indicating a likely attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ketchas.ru/uplcv?utm_term=1+minute+monologue+from+hairspray
    • https://cleaner.pl/userfiles/file/71780804944.pdf
    • http://foto-klub.dk/userfiles/file/xiwekevave.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c326463d6f2---40012214194.pdf
    • http://allnatureint.com/userfiles/file/24138495936.pdf
    • http://kolasinprevoz.rs/slike/files/judanufolojofuwodinosasa.pdf
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/a13f1c0905ef4e407a94d6b7ec009907/zatomik.pdf
    • https://monyetmesum.com/contents//files/zudumetoje.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e130e43bc---rujeraxarujo.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/c48153fb245f77f49dd1b89f8215c5e3/xatikujirujekuj.pdf
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1608379d79d5f4---katapumodek.pdf
    • https://samsungvrvklima.com/upload/ckfinder/files/pulutazemekepomalizuv.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16086513ac0c89---wagatolinegiba.pdf
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/8a0e7f2686ea4ecf1bc35e147045ae3f/bikosisu.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/a5ad58f51753ee5440823da7ab271105/judixepapuronujijiwuxezil.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad51bd10737---ravedixewelesudezimob.pdf
    • https://dadesigning.com/daduserfiles/files/tinakuduwo.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1004aadbc---104131100.pdf
    • http://asianmosaicnyc.com/userfiles/file/lipesemesisuni.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/5ts7ur63sd1rlev7hojhoebq72/jemotifasagugopivuvuxaza.pdf
    • https://cakenflowersonline.com/userfiles/file/kezolamixavuragu.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/r7hqrk2t56iabqsqpq3ogpdsn7/senowidegidubujokirewi.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/e98v7tc2r6olr929sk54j2qmh3/86854470685.pdf
    • http://polish-house.com/uploades/fckeditorfile/bejugilufum.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/c445652f3a7b11f7e951c75db2992ed8/5725877848.pdf
    • 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_off0000e8f3.bin
bf8d66357319051f7e80a9014e02928d66e65836e8188155b940e9f4a9ab7719
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F3 10972 bytes
font_01_sfnt_off0001023f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1023F 16792 bytes
font_02_sfnt_off00011a51.bin
43e52938cade9fb423a4380230f67ea40d68b49e37a1ee29e1490c19cd28d0de
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A51 17312 bytes