Malicious PDF — malware analysis report

Static analysis result for SHA-256 a76305395fd84fff…

MALICIOUS

PDF

80.2 KB Created: 2021-09-03 16:23:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ac594a094d6ed497d2361f03009d2b76 SHA-1: af6884a79c34c3cd821b98dbc03a21eea861b7a9 SHA-256: a76305395fd84fff78caf5326c41d4806eb9e750f1f3882eff6dda827f30e33c
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm designed to manipulate search engine results. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised upload paths suggests an attempt to host malicious content or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://tms-technology.com/ckfinder/userfiles/files/27649890942.pdf In PDF document text
    • http://mprime.net/ckfinder/userfiles/files/juzopasewodinijed.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/g68tju4ek7ajcbgovvutcr859n/gafutaraku.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/44539565154.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/74484975946.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/d1ceb8548b8cb087c6a4179ddbbad06d/kolubuxuda.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16085875c5b394---37842379960.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/kanovoposum.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948074de3ec---kupos.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210828_9BF6FB905AEDC179.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/i8aijj0ik67srmmbkd0m5vaf2cgha8jr/kowujutikukevaneva.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/winuzakafurisekubamoj.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2d833d89d---31714140483.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/13156830656.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fe6ef00db33---wolezibimibedum.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608db25b2ac90---sofawagulake.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f08d0c34f---15653487317.pdfIn PDF document text
    • http://bhs-class1957.com/clients/35434/File/40649415324.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160ade927398fb---vulijigozufupitabo.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/filomikurojukofezupevogu.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/72625411012.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf3dad6631---lemowur.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/besilidebafi.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/cb2oo1l6vja2iqepod8g0g6qj4/9650923753.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=saeco+coffee+machine+manual+downloadPDF 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_off0000d25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25B 18700 bytes
SHA-256: 47148ce025569055bc429de4ada30a2cec58d66d672357d5c92330c20240a7c7
font_01_sfnt_off000102e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E9 10636 bytes
SHA-256: 2b96827b149762c04b91b1b01905a5f8ccfec88e7e62b5748fcd1db5d86fbbd6
font_02_sfnt_off00011b0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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