Malicious PDF — malware analysis report

Static analysis result for SHA-256 e163b57172050199…

MALICIOUS

PDF

89.4 KB Created: 2021-08-04 17:52:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 766c79b136b4fdfd7a6376a5fedeaf50 SHA-1: 8afadb2256a9a8bff170c8d87856fe0ee5f700d0 SHA-256: e163b57172050199a5439a8d4ce36bf552d9c1e0707e26c3c6819b88ebf4b276
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 compromised websites, suggesting a link farm or phishing lure. The PDF structure and embedded links point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cab463d546---30065951964.pdf In PDF document text
    • http://gat-asset.com/CKEdit/upload/files/zolimurivematenezomo.pdfIn PDF document text
    • http://ltptech.vn/uploads/userfiles/file/70359934487.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/50d8b550510a4fdcaaf8fcb441f5bc3d/vexivometegulevaf.pdfIn PDF document text
    • http://rideco.hu/upload/file/90833086723.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1c226b429---96987621082.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/b1f373cf37dab09003fe0316d3c8bc02/misolurizebiv.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608544e3af39e---75540854388.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/09cgqhk9ald1pgr4bqi44chlue/87331324714.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/83978783817.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/62719101918.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/nofubibufapekunes.pdfIn PDF document text
    • http://nappsa.org/userfiles/file/sajibixekikonotenusubom.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/c9a2e1a7f84402d61a7f6a6d671db698/6148332443.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/f7e878075558395dfdb5d695a446d3a8/debasufoxewivanekeruti.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b52dfc25a18---rerefavufarelo.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/kadotugubekuvigug.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/wuwadiwi.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/77528899134.pdfIn PDF document text
    • https://familienarbeit3plus.ch/userfiles/files/bitexugazowowovazabe.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/nizurelifunuvok.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/18cfe65af36de6e1362f7754bfa07e2d/damutegof.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f20427279d---36737207435.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/89382399959.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=what+is+spatial+arrangement+geographyPDF 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_off0000f95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95B 10804 bytes
SHA-256: 79c44f85c4fcb144517e570b72451e643d8010db583c1058d155944b49e72546
font_01_sfnt_off00011217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11217 17040 bytes
SHA-256: d5c42a934d3016ee0e70bcab0ca3c2da4ae50570cec5dee418a540f0c7048e10
font_02_sfnt_off00013e5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1