Malicious PDF — malware analysis report

Static analysis result for SHA-256 979836b58abe1e59…

MALICIOUS

PDF

74.2 KB Created: 2021-07-06 19:22:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fb0af6423b231479dda6f429ca4537ce SHA-1: 4750a7ebc04108e3622e42b426769bb2373ea8f9 SHA-256: 979836b58abe1e5917189023ba32821696a8e3f6c5ce39d4d265269dc6ed836e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URIs and points to compromised WordPress upload storage, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URLs point to a common pattern of using compromised sites to host malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://laborke.ru/uplcv?utm_term=writ+of+summons+form
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607200a20c563---66528711998.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/sgk3g67garojc15vn57qrnmh05/28236985883.pdf
    • http://exoticland.bg/upload/files/files/8258377821.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/45fa8af31238ef5cf9e700cba2d6017e/50511071578.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/374002269a29534a15bd262565f99804/36210898422.pdf
    • https://vanrun-it.nl/userfiles/files/tevurevototezu.pdf
    • http://dgjinhak.kr/DATA/upload/files/202106060249408749.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608874c124168---46280226130.pdf
    • https://vatlieutaphu.com/upload/files/xuwokozaserafora.pdf
    • http://adams-gold.ru/archive/image/file/gejogasalabikurukeg.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/d3ed4daa3e63eeae90b8cd21394415d0/sopatukusuvibovukij.pdf
    • http://bahtiyardishekimi.com/fckfiles/file/50709345177.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/29464a1679cf936fd7dc565d06b42537/wemafevi.pdf
    • http://ongnuocdenhat.com/upload/files/moximopig.pdf
    • https://zabulgaria.org/userfiles/file/5181892761.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/18b4f8a62b7907e328bf29f7f16b10e7/fogowuxasefikolodimufupas.pdf
    • http://ya-ke.cn/admin/upload/ludebun.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b2874441c---xujoxususumevivuwudatub.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccdaa477f8---71288519516.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce2f149c3f---45061075562.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5eb7ae4448---tezisisog.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae84add1269---62619267851.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983c55631bc---60888176560.pdf
    • http://hvpeds.com/upload/contents/file/xuded.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_off0000c0a5.bin
f7ed6204829fd10ddc64fd867c367a2d781001ca3ab5f8af8f2f47f537187c62
pdf-font-stream PDF embedded font (sfnt) at offset 0xC0A5 10128 bytes
font_01_sfnt_off0000d742.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD742 16792 bytes
font_02_sfnt_off0000ef54.bin
ce8f1ae8114ff9e3109bf379845a48c187d23ea3093dc01366a0844cf732e470
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF54 16508 bytes