Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fda22956d33d8b8…

MALICIOUS

PDF

94.1 KB Created: 2021-08-20 22:30:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 1fec263bb66f2835e22ff2826c04a069 SHA-1: e290282465ea0e6d129e6dca02f200d765eedd87 SHA-256: 1fda22956d33d8b89cd8a3c1bdf5e5b5d7cb6950ae22cf5958c1287ab89cfa2d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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 http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb4facf631---nanemawudibokirusodunato.pdf In PDF document text
    • http://agataklimowska.pl/userfiles/file/24119141856.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/1f70mgnk69u7iftr96s9op9acc/9107404490.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/r5bb8blpm70lpaaauhcrgg0vl0/nisurikilov.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ggcpvufvmhraujrrgqfe7rqg3m/kimafekabulavarosudom.pdfIn PDF document text
    • http://unsersohn.ch/images/file/52508795634.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c009999fdaa---dopomuxajojepelaserefuko.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/37811478700.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/xinem.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160872967b2d67---16969342266.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a20bb88bf0---342473251.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/1485473999.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/56253891264.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608c50cf89f17---85582459224.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/medasixisatukodaponuno.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/0dc4ef11a2273579e1c19830a2fb8c5e/50802879396.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a020f20c4b2---25438644537.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f5e076dd1---kawerilubabubajidog.pdfIn PDF document text
    • https://pendekaremas.com/contents//files/dulipozuxolipo.pdfIn PDF document text
    • http://texmet.pl/userimages/file/57631626473.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/04b38fc16b213821ce2ed0f6f6332503/wagamizutokuwudokobisedal.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/063c90b63d9f14d4521759c19396a540/bojefovifutenekajol.pdfIn PDF document text
    • http://tochuchoinghi.org/files/22975743127.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b609d741550---levedofi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=black+clover+asta+full+demon+form+mangaPDF 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_off0000f5a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010db9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB9 11036 bytes
SHA-256: e33851ebc45603a6770106fd76589e2acbb3c78b9babbd861e6e0c4e2756b087
font_02_sfnt_off0001274d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1274D 17268 bytes
SHA-256: 4160d1814069b14a6a203c8b741d31097b6b4869de653e97f296767c2b8d1e68
font_03_sfnt_off00015444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15444 16340 bytes
SHA-256: 88a5f3ad9079b2340172ecd64f1cd79ba1ad1753eb2b73e58de10c5a7be67d15

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