Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a71cb1f92ed6378…

MALICIOUS

PDF

77.2 KB Created: 2021-07-22 11:53:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 53704857264670f494336bc1b005b800 SHA-1: aba9a8505ae08154d9cb471ef48ab916bae79101 SHA-256: 2a71cb1f92ed63784d7470797f8593f0bb348db916295a19e8c6101b87ca6e6b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to PDF files hosted on compromised CMS upload storage and disposable domains. The primary purpose appears to be directing users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://smeclassof1987reunion.com/clients/37165/File/xudalagokebepob.pdf
    • http://www.asslar.de/downloads/47696416878.pdf
    • http://baggiez.net/userfiles/file/14573883205.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/427622f26484ffa3d992afdc50765e10/beworadonanerofowel.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/4rtsmd8ce88aljndbv301ck6b6/tufoxexex.pdf
    • http://npi-management.org/ressource/site-image/files/bozimuwu.pdf
    • https://kermoulin.com/userfiles/file/17253300256.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160d213f8d0683---95260981963.pdf
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/cf54d927c80648858f8dab7fe853ea35/79948345871.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c763c0290---tadawugeleda.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e880f0f0e69---19764544224.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/45a40b2a96e733485f9568b5b73983db/89468092957.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfd1c0b187a---76212793809.pdf
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/a067947bed42d06db637c4694283d844/97231240512.pdf
    • https://eingangrad.ch/userfiles/files/34876369948.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608837a67da37---70442337423.pdf
    • https://nangluongvada.com/uploads/files/kaxefe.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/48020f095ddba361f5e52d5c2aa96130/10925562836.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607676716fdb9---volivesav.pdf
    • https://gegeny.hu/uploads/file/xudoriwovorason.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607861f4dbcb5---delagakerizukaluzizupen.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd197c448b2---bujitufufipabuvirilowawi.pdf
    • http://asupuro.com/user_data/image//file/99964766231.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/fsrmnirtcad78uhp7ver9cqts2/43575157748.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=heaven+beautiful+images
    • 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_off0000ce33.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE33 16792 bytes
font_01_sfnt_off0000e64a.bin
6dc33147d2f32fea17870f39845708f7b1469b4f447fe5d441badef26f13a2c0
pdf-font-stream PDF embedded font (sfnt) at offset 0xE64A 10636 bytes
font_02_sfnt_off0000fe95.bin
43ba068d7fb7b319cbd2c434054c8ebd39168f55a56fa077f4ebc35bfa309d37
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE95 15652 bytes