Malicious PDF — malware analysis report

Static analysis result for SHA-256 450451c93cf2a862…

MALICIOUS

PDF

94.0 KB Created: 2021-06-26 04:43:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2dc1544d6ff9750f3c3f61a85d32b576 SHA-1: 0028edffe78f038c7b69d1684d7674bfbddc6b48 SHA-256: 450451c93cf2a8626ab7f03baa6fc2e8480a2275a03a17b848f8e05604fe0ff4
156 Risk Score

Malware Insights

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

The PDF document contains numerous links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077793c16820---senasametukazeriji.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f61b8634c---vabiribufotagok.pdf
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/vukapavebaruku.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd38fbed267---92292379328.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a24f1bc76---kekagi.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/tmppv1b61jj1npskjhd1p4g21h/gedolabukitezuxevumimesov.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/4c8717065207273a0fc65ee95aa24e78/25407902612.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cad889d539---26708646694.pdf
    • https://abugfreemind.com/userfiles/file/teximaritufu.pdf
    • http://guides2alpes.fr/uploads/file/92879607651.pdf
    • https://limblength-sldf.com/userfiles/file/1650935066.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f9eb2f505---75836472610.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/i20u0q0v29a5u5qihbcvmiasj8/vigofiminokoravatirobumox.pdf
    • http://djpress.pl/Image/files/18051600824.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9892068c6---52534627750.pdf
    • http://ankamet.com/userfiles/file/puvixixolabilipikonodipe.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16087ff4e58911---buwuvatijubaziketaven.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16083e99a71809---74650569989.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609834ae77beb---59710108608.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607894172b1bd---vowapuzidufofozukabidiso.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f0d1ae772---besizujimuwefazosar.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/451a37eaed652772ec9cdb0595d90687/16536660081.pdf
    • http://cukorbetegshop.hu/files/93458651250.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/0a2fd38e715afa3e53e94789aa0744ed/lajinovonizuvesudanipoxo.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080d8f55120a---fijuj.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16087fac596688---sekas.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=hosanna+to+the+lord
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0af.bin
c75f4338d77b52709f8f9e92fb46f6745fb46b6e591a36c31c5bbf70750a0c11		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AF 16916 bytes
font_01_sfnt_off0001092f.bin
b59e77e33c42e092980a28d287445f1e8a81b35c793419eb7b959ae8199e1ec3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1092F 18400 bytes
font_02_sfnt_off000139cd.bin
5267df921ee8ff3a96fd430db29012a303c51ec740a108d27f3e58316c7cdbf5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x139CD 10244 bytes
font_03_sfnt_off000150b8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x150B8 16792 bytes

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