Malicious PDF — malware analysis report

Static analysis result for SHA-256 bec3e9798afe7def…

MALICIOUS

PDF

87.0 KB Created: 2021-09-02 07:25:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f81c5c327617e2b7bb3ce5195016c370 SHA-1: a109cb92415c8322d50295e3f09d82e87ff44f50 SHA-256: bec3e9798afe7def20eba9534c67a0d73f9600d6379204dcbe3964ffa6303bca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The PDF itself contains no readable content, further supporting its role as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f5fb9990ae044fbbf07f42bd6e5e166b/govuwogimeto.pdf In PDF document text
    • http://ks4073.com/file_media/file_image/file/wilapi.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1610e0c1df025b---98521694444.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f64b438c59---84588447114.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/jofuzalix.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/62168514166.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46039874392.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/tisipiz.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/5298887bf53744fd8880f8c838c48e20/xekoxasuv.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/91837399446.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608155aff1c30---57278400077.pdfIn PDF document text
    • http://dr-temt.ru/images/file/zuvirozek.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/duwetategexujof.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/9192035675.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/vopibexipe.pdfIn PDF document text
    • http://multifamilyfoundation.org/clients/3/38/38c33163524538bb895552046de0b362/File/46004440214.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/49112474889.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/fichiers/49590992022.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070126c410ae---36433410415.pdfIn PDF document text
    • https://roomart.uz/ckfinder/userfiles/files/vefuzunibupiwodulok.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/tawonamujovagepanuw.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/kolojoretiwovokovaso.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/88718351465.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=full+body+stretching+exercises+for+beginnersPDF 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_off0000edc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DE 11028 bytes
SHA-256: 51af871255f2cc2469225d5a4f842a89d756c43f39f3876964a2dd1482f350ed
font_02_sfnt_off00011f3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3E 17880 bytes
SHA-256: 3e20476324b6ec033a5010b3c4ea076877480ff18863c733ce973e164c71cca5