Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee540c1a581609e9…

MALICIOUS

PDF

87.5 KB Created: 2021-06-29 12:44:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 747db09d53084e6fc1d0c83b11b4d691 SHA-1: de1f72feafac3730b3ba6b0621ee3379fdf43fcf SHA-256: ee540c1a581609e93dad4f1d92076881549bb310512aa8aad6a60e06847a57c3
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external resources, many of which point to compromised CMS upload directories, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and link farms further supports the conclusion that this document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://auto-spec.ca/fck/file/sabiwurepojakazaxakef.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b407b46143c---33468378158.pdf
    • http://onishi-kyosendo.jp/archive/3349274060.pdf
    • https://bonacorsi.it/file/bokopos.pdf
    • https://allmassage.net/upload/file/20210629094911.pdf
    • http://bronia.org/userfiles/file/bevojibotejokepixas.pdf
    • http://woorymart.com/userData/board/file/56309947034.pdf
    • http://easyreturn.store/userfiles/file/pazagalobilub.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/20fb8f0c4449905c7629a37451ff347c/rikiriduvozoferawamepo.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/306cf9a7b8b41fe0d1819460504fc0c0/wofadi.pdf
    • http://habitat3.eu/userfiles/files/57182902367.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/0sam0i4gb0t6a5u022pit82t66/47839928264.pdf
    • http://caratow.eu/userfiles/file/pipevununedoxiloxow.pdf
    • http://dhs1970.com/clients/9/98/98bceae81adeaace0f0761aa7b0d12fa/File/kezizowuxizozusub.pdf
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/91c0c4b102db31f65cffe80f9307b464/taxorenepenutak.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b752e864776---wiguwuwuxulerutojo.pdf
    • http://ahs1978hounds.com/clients/0/09/09313dc2b2b2138818c22350edca9cf7/File/92785593658.pdf
    • http://www.findvoters.com/userfiles/file/kokelugoba.pdf
    • http://mtecommerce.it/public/news/file/paxazakakasukitijowafaf.pdf
    • http://karthikeyanjayaram.com/userfiles/file/rovamikulamojoj.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/67bbce849442cf4940d0d0d0db293178/ladole.pdf
    • https://europartner2.pl/uploads/tinoxijujujir.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/9kpbttgvetnmn9jaecinbabieh/63590178279.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=countries+trivia+questions+and+answers
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/ac9f0bb64083b68fc0a1a090b35efbb7/2050475776.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://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_off0000f15a.bin
8cf3ca0b006d06953cc823b4fc1970cdd0d99568c0737fc34d64c5b1ee2dd461
pdf-font-stream PDF embedded font (sfnt) at offset 0xF15A 17932 bytes
font_01_sfnt_off0001203b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1203B 16792 bytes
font_02_sfnt_off00013852.bin
52b4a1a4f2f1faebb17ea54fc90629797309426e8ddf2f462e65bf16b210b20c
pdf-font-stream PDF embedded font (sfnt) at offset 0x13852 10624 bytes