Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd583aaa51564332…

MALICIOUS

PDF

74.6 KB Created: 2021-08-28 05:30:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3c3d22c876be420b435f3004cdf630a2 SHA-1: 149a48df0de3a9f03fdc2ea41400b15c2d449353 SHA-256: fd583aaa51564332e3f5d4f6495412ed95afcedd65f83f011375dda1f0fcfffe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised or unknown websites, likely for phishing or malware delivery. The presence of numerous URLs, many hosted on potentially disposable or compromised domains, supports this attack pattern.

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://babamoleskine.com/files/file/mejefegafunem.pdf In PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/c6c74c84ae01cf1b09b19c575e3dbd69/jalavepaxavigewosulen.pdfIn PDF document text
    • https://discovery99.com/userfiles/file/webowotujuzawib.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/lolugepumono.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ded5b424a3c---5645078362.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/52409968494.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8dd1d057c---lenamiwejup.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9bcb5d607---48392573402.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/silewoxazabemuvuw.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/fopizozufexepolajafo.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/77691651276.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/c51r44198htb577co474i9u3i1/megepuxuwezitefuvujowut.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/pokulevufegawigifefab.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a87f335cdd7---39545186779.pdfIn PDF document text
    • http://anm-av.de/uploads/files/72627181506.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/c5a1e42f7e61a3d4259e470cadca48cf/57180901713.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/2b0a12079bde62a4146af65201c66275/40693284266.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/13350068935.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609f6162bd2a7---kipobadaboxizepo.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2081506f49---parufujobal.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/dawazudiwajinuzatupuga.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/82547597941.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160973360d2181---mixenaruxaporokosijenimot.pdfIn PDF document text
    • https://ms01bet.com/contents/files/73733577485.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/ec922af5cdee2b208822d69f6fe76a29/wikatonuba.pdfIn PDF document text
    • http://ourhkg.com/UPFILE/userfiles/files/140435010.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=investment+funds+pdfPDF 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_off0000c611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC611 10256 bytes
SHA-256: 742dc295937ec4d4737edd52a3ce6fc38d808384b9378119d66c401e42f8a587
font_01_sfnt_off0000dd1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1B 15460 bytes
SHA-256: 3088128f9b3863f43ad46720ad955a49957ff160cec74fdb94c041285d1a4fcf
font_02_sfnt_off0001042b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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