Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2223319ad9d7c71…

MALICIOUS

PDF

70.3 KB Created: 2021-09-29 03:11:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: df32c234246af379259584b0b08f29b8 SHA-1: 34490336e0710018de638eb77c9680e673701638 SHA-256: a2223319ad9d7c7190d71f4c5d11bd7b5ec3a72987f7fe15b4f034c6894c01c0
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing sites or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=voice+changer+to+female+apk PDF link annotation
    • http://likebarcode.com/image/files/20210913_220940.pdfIn PDF document text
    • http://zatacorp.com/upload/files/20386368659.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/41914177901.pdfIn PDF document text
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/28977863347.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/7d328113053cac7a7bf6e7c497e9b687/77305066567.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/68536353466.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/20126358136.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109282353272774.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/votixolo.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/58973343459.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/40401762422.pdfIn PDF document text
    • https://quangcaowebsite.xemlaco.com/uploads/files/35078003320.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210919_08E8D26A3E98E40A.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/buzigo.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16136629112cf6---bepipodizeginesaz.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16151b8189609a---34413590033.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210906231759.pdfIn PDF document text
    • http://hevolta.com/upload/file/falafux.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/sijikelatapenuzogulukof.pdfIn PDF document text
    • http://codienlanhtrangia.com/Images_upload/files/31022356356.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/duzanikanogo.pdfIn PDF document text
    • http://topstec.com/d/files/14524500241.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_off0000afcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFCB 10820 bytes
SHA-256: 2619b1154574572080b36ce8766ecb12433e0fdc810b9cf8a9a458248782b380
font_01_sfnt_off0000c89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC89B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AD 17192 bytes
SHA-256: 732b7f18fcb01856acf14d5cc6e189ed4cea8cc32b34e8b0d132bf01375de51e