Malicious PDF — malware analysis report

Static analysis result for SHA-256 b88cdfbb14a79b35…

MALICIOUS

PDF

87.3 KB Created: 2021-06-28 05:11:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0a949a0562cbd134e01fd3a1d902fdbf SHA-1: 55e07e06735106400e844f2c4f632d9effc54564 SHA-256: b88cdfbb14a79b35f5b8c5058ad33ad0760e806da6319eb5bab1ad3cdd48ccd4
156 Risk Score

Malware Insights

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

The 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 WordPress installations and disposable hosting. This suggests the document is designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/7cb993c97aa95e985496286a32852465/dewipiluma.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c966ed0ea32---6974158183.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/rrek05colahu7005qgdq26vaij/90723873618.pdf
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160722720a72a0---98875981686.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/4h8okoop7k0ll4tic384hg7up8/gowuwu.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ogdq5oinhm6q21sho17n4mcvn9/15578567834.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/79681036d8d24005b5415ecc5be0a243/65597210631.pdf
    • http://wksystems.net/HotelEstimator/userfiles/file/verabiloxibajejopuw.pdf
    • http://akinmedical.com/uploads/file/97214905313.pdf
    • http://www.anieliasfx.com/uploads/textareas/file/46792266889.pdf
    • https://reinigungsfee007.de/wp-content/plugins/super-forms/uploads/php/files/h1eujmeooq4vvveeca66p8jcve/29784741979.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16085d50783e1f---makekededizinofokusidup.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/gj08qui7iv30tnlnmuijrcfq3q/wigudap.pdf
    • http://nhadep30giay.com/uploads/image/files/muxigofudopal.pdf
    • https://cplastik.cz/data/cms/file/tatifuramolosewa.pdf
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/5kdtg40ug9a7rlkidqbcbmi2ki/95829990844.pdf
    • http://innotack.com/userfiles/files/ginuwiwiliku.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a645ab584e8---lovufodekugamis.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a87c68444---48845058256.pdf
    • http://www.cerathai.com/image/upload/File/58896450503.pdf
    • https://agrilaui.com/userfiles/file/52294896590.pdf
    • http://whalesart.com/uploadfile/file///2021062320041742.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/05bc17433260e86b3df5fac5846db5d6/tamulexan.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082715389ed9---94635945718.pdf
    • https://maydangson.com/vietkiendo/upload/file/13445151245.pdf
    • http://sostrevalli.it/userfiles/files/kupizexav.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=cast+from+step+up
    • 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_off0000f276.bin
a2076d7052b2a373288bbf5ec7707430033989a72040a3a9ac02022cf1d5b477
pdf-font-stream PDF embedded font (sfnt) at offset 0xF276 16984 bytes
font_01_sfnt_off00011ed1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED1 16792 bytes
font_02_sfnt_off000136e8.bin
8f3bb51a971847b0d786a5e1e732b0f3c11aa8c74747564456780a4fe7d7918c
pdf-font-stream PDF embedded font (sfnt) at offset 0x136E8 10408 bytes