Malicious PDF — malware analysis report

Static analysis result for SHA-256 986738cfab945b49…

MALICIOUS

PDF

83.2 KB Created: 2021-09-05 14:37:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a230e22a8c8ba9330aa3e3a3f47a70d3 SHA-1: 1c84a66d509e8484531e1014edf622fdf16dc01a SHA-256: 986738cfab945b497763fc3b768ff35bb80587090f5d06e691442c46b92a79c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm to distribute malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure indicates a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9862

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://spoilersmensgolfclub.com/clients/865201/File/lefaxamipileno.pdf
    • http://bbfrontedelmare.com/userfiles/files/45109527092.pdf
    • http://www.tomasjelinek.com/img/pub/file/sumunisa.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16078fb3f8d6e9---36695530074.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a5da880f3---jibidu.pdf
    • http://pitafest.com/clients/1/13/1337b7689af00ddd847345d48bd720ff/File/sezalatuk.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/ndqlt3dvoeesfhlhr3f2lpqat6/setokevi.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/e9549555fe2e7066cd9b9ab19472f344/begaxuwofip.pdf
    • https://protrialse.eu/files/files/tinowabuwisenab.pdf
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856c26a00d9---89233865796.pdf
    • http://firegallery.ru/img/upload/54384000037.pdf
    • http://shriramashramssschool.org/userfiles/file/88741100986.pdf
    • https://crownprolaw.cn/userfiles/Proj_Name/files/40556929511.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d2ec2d5a032---sivinizobebuvozofimuz.pdf
    • http://thompsonhigh1980.com/clients/4/48/48b9e10b24f1ac3c627dfd5bb8c45987/File/gewijafubukuloma.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7ee6jnvi04eenisbfg7kg8hf94/dudoxume.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbff6656d54---makifefefepitafasu.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/7fh7csqo1vn59vtcc6vp6g0d2j/vixuj.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ee834d610ba---kaloduf.pdf
    • http://lncxjzxxw.com/upload_fck/file/2021-7-10/20210710032805414420.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/75156568960d0a83be6778.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7392aecb31---nanatopas.pdf
    • http://ciskmv.com/css/file/20385117887.pdf
    • http://hodori247.com/uploads/files/dogimidevuf.pdf
    • http://grandviewgroupresort.com/upload/files/netabogoni.pdf
    • http://cansuyu.org/resimler/files/13878498981.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=smear+preparation+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://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_off0000e3ba.bin
79a85739a7a4c70e8d78ce0a6fc85b48a091664059b1f3ab98262f6d0e849e89
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BA 17484 bytes
font_01_sfnt_off00011079.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11079 16792 bytes
font_02_sfnt_off00012890.bin
0e09a2b3c718f05ad459df70746c7e8fe54f6bf98bce99727d07690fbba0b3bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x12890 10520 bytes