Malicious PDF — malware analysis report

Static analysis result for SHA-256 98367037d25fa00b…

MALICIOUS

PDF

87.7 KB Created: 2021-06-30 04:27:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a744b7a0eb6b0cc73f8656dd02d75f60 SHA-1: 61bbafb4baa96751c6cd8388a4fb71a025db3978 SHA-256: 98367037d25fa00bd2239d665a2b0244f1be2d8c02bae6cb7d7ea7e7e4f0e49c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://olimpic.hu/ckfinder/userfiles/files/95677218789.pdf
    • http://jshtextile.com/UserFiles/file///nenitadopufixuzez.pdf
    • https://veterinarycarefoundation.org/userfiles/file/7365716472.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b114ac70a3c---63328585861.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/cd5578ef94c1ad68638880e08e1535a4/48884247356.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/9cc0db37647f03b7dded5a34c6fcca99/vapemerebedewo.pdf
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/2891837b0169e6e79798bfc1de274973/lazanepigekomosumuka.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/1ku3uihbe2vu2cpc14iakaq4hj/mesinovorejasoziril.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/44ceca9b7604fa3886f3bdca92c73dd6/50945692218.pdf
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc128c9533---72650304945.pdf
    • http://espacioschillout.es/images/admin/file/21839582204.pdf
    • https://matskaren.se/anvandarbilder/203/files/38236347006.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/6fiohs2pla8ofn72obtictos27/dezimetugawudajowebu.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/8ofh43ebdr25798qucotrs1nc7/39965887674.pdf
    • http://vds-construct.pl/userfiles/file/metogu.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944a6b07c40---8119363069.pdf
    • http://yjsyrj.com/userfiles/file/71573938454.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/aad100cd9988bd91ab40cb9a0b272a6e/53626148713.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a56a58d6ced---xujizasadopuvijev.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1b93252a6---5575426612.pdf
    • https://aedwea.com/upload/foto/lirodejadokuku.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=t+launcher+for+android+java+edition
    • 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_off0000e1c2.bin
0a39febc53e4e3b1444522eb3c6c612cf61cbac66680d9331622a95620f1a4cf
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C2 16416 bytes
font_01_sfnt_off00010bbb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBB 16792 bytes
font_02_sfnt_off000123cc.bin
a013ce2342554bbd70a9f85285a6053b67e9b25eaba0dd22223cc179b1b1ea16
pdf-font-stream PDF embedded font (sfnt) at offset 0x123CC 16064 bytes
font_03_sfnt_off000138e1.bin
e223efcc62ee026fd8820ce772f9182d4eb33f079e9733695f557558de500819
pdf-font-stream PDF embedded font (sfnt) at offset 0x138E1 10664 bytes