Malicious PDF — malware analysis report

Static analysis result for SHA-256 653c7ceae3f26442…

MALICIOUS

PDF

83.7 KB Created: 2021-09-14 01:35:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d96f5884fe2221aa643ef6b1c5ce84af SHA-1: 5bddbfe24d62b5435cec1ef65e3bf3bfa727dca0 SHA-256: 653c7ceae3f264426bb65869f6b80b2cab203b9df5168b4e8dcf71387e5bc854
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous embedded URLs, many of which point to compromised WordPress sites acting as a link farm. One URL, 'https://ketchas.ru/uplcv?utm_term=forsaken+world+mobile+apk', suggests a lure related to mobile applications, potentially for malware distribution or phishing. No scripts were extracted, but the structure and URL distribution are indicative of a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ketchas.ru/uplcv?utm_term=forsaken+world+mobile+apk PDF link annotation
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f350ee25f7---ritolepisolibidodeda.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/54304275492.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135960850bdd---56155556606.pdfIn PDF document text
    • https://pomacanthe-art.fr/imagebeforeafter/files/kiboposukaravefosax.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/27290983252.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/bunirixet.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134687c3b88d---49538323081.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/lidogotazo.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/1523429096.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/64570186618.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/91947311244.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/vozevijojonubunekebevigiz.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/zizumekiwumiled.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/15121867580.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/8c00ecc67f1cdb35276e7fd25ac23a44/59959862064.pdfIn PDF document text
    • http://esistore.be/userfiles/file/mewakivab.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/sixuxefowel.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/16845706871.pdfIn PDF document text
    • https://moulindelarroque.com/userfiles/file/gafotuvazofubodijezeri.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/fuxazidofomumobagixe.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/dosixugoj.pdfIn PDF document text
    • https://sthouseluxury.com/upload/files/zoxigupudetaxi.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/65712580931.pdfIn PDF document text
    • 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_off0000dbf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF5 19900 bytes
SHA-256: c60918fd92222351f28c007ebc947cb06a5fa2c8119b590ecfb155a5cfabb92d
font_01_sfnt_off000110b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128CF 10748 bytes
SHA-256: 286e454bdf99082313a09033aa81550bf868a3eae25b979b2f57547956edc6f1

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