Malicious PDF — malware analysis report

Static analysis result for SHA-256 18d1b81661229fa5…

MALICIOUS

PDF

83.5 KB Created: 2021-09-16 21:00:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4ca2e18e3c2846ac1096d2dbd8fa668f SHA-1: 353d5084129cc172bcfb095f1aa44a68d62c3d3e SHA-256: 18d1b81661229fa56f3e39e0b6c204cb604eb1c46d79ddc4873e2b74ed1d396d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://fishuntpesca.it/file/gamizoberuronute.pdf In PDF document text
    • http://life-worldwide.org/assets/uploads/files/sigazarapasabikoju.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/86435129303.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/silegowitizibawa.pdfIn PDF document text
    • http://damosushipleasanthill.com/uploads/files/zajovewig.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/lekezuvorepubup.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/c2ae2333463b062f922c1d9da1fe4261/32588128328.pdfIn PDF document text
    • http://rubensova16.cz/files/file/sixomix.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140c930dac51---40642306759.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/bawuxi.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/nigujaw.pdfIn PDF document text
    • http://praguetransfer.com/files/file/59925097404.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/tebexufalexugopiwejad.pdfIn PDF document text
    • http://kesifveotesi.com/files/58260736842.pdfIn PDF document text
    • https://siltri.com/fck_upload/file/82632173339.pdfIn PDF document text
    • http://worldwidestationeryholdings.com/files/file/42720877724.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/52513328881.pdfIn PDF document text
    • https://mkontroll.hu/File/zubavewaputonufamazuxode.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/40702074861.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/94580889919.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/20707872612.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/xolevolekolalagigenoj.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/vubomajaxizelef.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/rirefofe.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/61264990258.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416f59650aa---bavanenap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=android+intent+putextra+and+getextra+examplePDF 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_off0000db7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7B 10748 bytes
SHA-256: 6bdefb4ad460f0d3115826e5c10984aff38c2556276e53077dd3a40e661f5595
font_01_sfnt_off0000f3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C03 19204 bytes
SHA-256: e6cac425fc43e32a04a4a6724d193dff7bbb9b488f8c23e1623e8ea36f452d0e

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