Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e4f6ad2c211c0e8…

MALICIOUS

PDF

100.4 KB Created: 2021-07-01 16:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 419ce508b1e0610008f025b8101f5dd4 SHA-1: 42e100522d0e3b64aa9e949771e5d57a0ab00f5a SHA-256: 7e4f6ad2c211c0e8a8ab14bbb38a48fc5a1efe09453d255a7c0b0dd585da84e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF 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 CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were extracted, the embedded URLs are the primary indicators of compromise, likely leading to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9415

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 http://mg001.cn/upload_fck/file/2021-5-20/20210520054925932386.pdf In PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/33936192030.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/1chqju507sp7hfpjrc3cuh9hnb/loxesidajafumodezag.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/udq08mh22at22a0ppquq7tpp4j/90412457732.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/243a7d5735fab143fa5a2bb0f4548f14/bewubujarakumo.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075bf5df2ebf---dazitijivobonuzatojasu.pdfIn PDF document text
    • https://cafesca.net/ckfinder/userfiles/files/48858663978.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/59888414223.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/wuletugovupujilofi.pdfIn PDF document text
    • http://mdc.ir/ckfinder/userfiles/files/zazeli.pdfIn PDF document text
    • http://0851gay.org/userfiles/202106file/2021061809425970554.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/zigif.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5d6ce8fa8---68220114270.pdfIn PDF document text
    • http://goref.ru/files/file/vuzogitusubujeli.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/9ac1ea7b87664829bd453b815822c074/sadatolugejelilevitip.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160b89789889fa---bigozibikara.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/4443b01b15ec6dfb50ea7dba593b2465/35748113989.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608019e0bd330---powegixaboxaxijobosol.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c90d82045e3---895350448.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/bmn5e6rg0qsvcho8s72h69pcv3/66728859323.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/powugadezuloponununekede.pdfIn PDF document text
    • http://riceart.ir/basefile/files/59124974368.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/06bb46273756b5a4188c25e9400e8ada/6185749001.pdfIn PDF document text
    • http://cherishedmomentphotos.com/clients/8/84/84fe84b553acfcd191e166b7401b6f02/File/xinesonavekuxodujopuf.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/tudapomuv.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/gjfi2ttouvbc9fu3u5rl83od8u/45465287418.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=text+to+fancy+textPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A5 32156 bytes
SHA-256: 608eace392d011ec6e15ce6d306db5380592f480acd2e3698692057a78decd01
font_02_sfnt_off00014bbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BBB 16832 bytes
SHA-256: 10bd0576c842998cffba70bceaa93fac6dbce526c233e4692bee7cd73d7d7117
font_03_sfnt_off000163a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163A8 1936 bytes
SHA-256: 8ef0cf587924376aaf7d88af5fe9e897244c43ca892660a5f7e00d0f3a2f8e46
font_04_sfnt_off00016cb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CB6 10104 bytes
SHA-256: e498104dcaccf6c79e86f31b1c06c6cbae74d44dfd99a373700d487bb8891bf3

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