Malicious PDF — malware analysis report

Static analysis result for SHA-256 67c3c4e8fd9b8df4…

MALICIOUS

PDF

90.3 KB Created: 2021-09-05 22:18:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 32fc5f8845818e4c8fbcd85aa493cb40 SHA-1: d72f592ad3cbdd87ef854609ad1eb1b2480fb12d SHA-256: 67c3c4e8fd9b8df4a03be92f7ff6a93b6a719accc74bc2301a8c82022a2a1335
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised CMS uploads or disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely used for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.houstonorientalrug.com/ckfinder/userfiles/files/fazaxetemizad.pdf In PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/68433167467.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/c768bbc0ca3f3f70f2c66cac2fb1813e/sepixejatiwiwozogaza.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/81203678682.pdfIn PDF document text
    • https://hijaulumut.com/contents//files/81362765780.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/3368271742.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/ip6u6tlst60jgkk0encsvr0641/37538916783.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/73325773636.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8b222f718---tepusazu.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaab137f3c8---77936905655.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210607130137251.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/32203976700.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/7b3pec7u2md0ghsmvkahcdj639/3661410389.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078608949041---73813134156.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/64591043657.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/terujixobezugojirot.pdfIn PDF document text
    • https://noddy.nu/images/file/10916297870.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608240ec61c4f---29992569072.pdfIn PDF document text
    • http://dd-eng.com/files/files/12667999315.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user///file/_0213991001626689456.pdfIn PDF document text
    • http://dzbnf.com/upload/file///tabomekikanekudeg.pdfIn PDF document text
    • https://people11people.gr/uploads/File/36253196063.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f1aade071---56885228476.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=gopro+hero+7+manual+focusPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C0 18768 bytes
SHA-256: ceaec479e0dbbf9d575b464d050d604a59393774a93b6e04d390248b5a4db524
font_01_sfnt_off00012b5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B5C 10744 bytes
SHA-256: 057d34b9139c9ed802a4e5b8974f4b5cee0cdfb3bc68781cabebea5588df616c
font_02_sfnt_off000143f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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