Malicious PDF — malware analysis report

Static analysis result for SHA-256 bef1070fca6d8eca…

MALICIOUS

PDF

96.4 KB Created: 2021-07-05 21:36:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 53af9f3b923b97eca24938844182f84c SHA-1: 87f33e5222ddfb53715b7d4ed30fc2469a2cbf8e SHA-256: bef1070fca6d8eca6f0786e9b686b35dbccd3ec5dfb9f00b2ebb2cc1ff12217b
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress sites and disposable hosting, indicating a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or downloads. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://rszm88.com/upfolder/e/files/20210604210017.pdf
    • https://gelblighting.com/userfiles/files/tasorupuxofupubawu.pdf
    • http://suachuathietbi.com/upload/files/nafebulipomododowowiruka.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098336a40483---vorop.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e273ac59e---tegojafakiluxetonave.pdf
    • https://netiko.ge/img/Data/file/71466300185.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b984e2875dc---15606120009.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/d59595b0f7aeeb337f6154b59f36a7fb/liwesuwoxewizofazat.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a42a917fe3a---45308927643.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/290d349e13bdac84d4f25d20876ab18e/mazunaruti.pdf
    • http://cateringkieuan.com/uploads/userfiles/file/zojufoxoxotimave.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717f34e6a1d---58009328403.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/7ce1f91a59ac635bda6435eb6af2ca9d/jobubamar.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/2728c4d4f1875a531b20a05be4306086/vijifu.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608031991d5e6---mejinegiwatesuzem.pdf
    • http://kashima.cc/userfiles/file/pigovunokunoru.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16075c3d7c5f54---xedan.pdf
    • http://schooldistrictservices.com/clients/f/f6/f6ab1571d2cdf5e569af7b76e288b17c/File/37569379711.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb27f03911---36106331158.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16075dc4fcf1cf---bukulup.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b72dae3897a---46652482809.pdf
    • https://apoiotelecom.com/imagens/img_fckeditor/file/13600634000.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=there+is+in+italian
    • 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_off000114cf.bin
e95966d3ff01a779f657d0715ca6d6b19773bf1921e579f9edab0607798dfa3f
pdf-font-stream PDF embedded font (sfnt) at offset 0x114CF 18684 bytes
font_01_sfnt_off0001450a.bin
ce77a97e1de13530141174741ea42f40513f8d8934ab386ed5aadfa3beaab552
pdf-font-stream PDF embedded font (sfnt) at offset 0x1450A 10048 bytes
font_02_sfnt_off00015b56.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15B56 16792 bytes