Malicious PDF — malware analysis report

Static analysis result for SHA-256 85bca25e1ba1d1dd…

MALICIOUS

PDF

84.3 KB Created: 2021-09-01 20:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 005b0ed12bc045a40bb7f7df35a89959 SHA-1: 8f7ad066873aad69f73bca1fe2793d98d87f68e0 SHA-256: 85bca25e1ba1d1dd75c5ef397e572335d740ba0c17273329d0b0f109ae2f45b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised CMS uploads and disposable domains, indicating a link farm designed to redirect users to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. Although no scripts were explicitly extracted, the nature of the embedded URLs and the PDF structure points towards an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://catamma.ru/uplcv?utm_term=eleven+by+tom+rogers+pdf PDF link annotation
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2e8d24c11---zetifutokixata.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/112205105608.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/13880544254.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/33107701561.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d909e617d9e---83462392065.pdfIn PDF document text
    • http://trip-sale.ru/userfiles/file/54583036617.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/xitumivavebe.pdfIn PDF document text
    • http://tms-technology.com/ckfinder/userfiles/files/44068271865.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1612da888bb195---vidasasovosefapek.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/157a1a487be616f74d6727fe0b0444f2/minimovivideka.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/b2f627d96c7d0864a3328e4d1bb35068/dekowiravug.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/zalidesodexulemowivotot.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/c990f29b1511544ab783287188013af4/kuwimofonigafowir.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3c9bd1335---nawitojaper.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/a92f1d62824be554d8fb23b0f9a069ad/varavoximi.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608edbd5550ab---44472051882.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/jubegalizubizupizikuna.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/83882941919.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/e15294e6c21ba9ef714a38bcaf045822/6030543166.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/577ea8ea191b9ff9132ec7b6f82e75e7/zufegulemojakobutuvevox.pdfIn PDF document text
    • https://wittnebel.dk/file/wobelekox.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/soi7e2t34mr8cjq1mdmqh698c2/jotumelokulosegixa.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/59089398333.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/b48385e112a729fc4c69692444e4289b/xugodejibeziz.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_off0000e491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE491 17796 bytes
SHA-256: 481818b1e0394c31c78d945a1d1577e248fb783d9caa979360034cebee6149b7
font_01_sfnt_off0001127b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A92 10892 bytes
SHA-256: a2f2f580c8352ba9b202a61f8af78639f3ad2f70707227730dbab5d24551d062

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