Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0bb273d5817bba8…

MALICIOUS

PDF

70.4 KB Created: 2021-09-26 23:02:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1e68a551f3501b1963d914bf605b5016 SHA-1: 1752fac7c167b6bdd599664454ce9c4f6770c3cc SHA-256: d0bb273d5817bba8da8d85fe31afb74df26dccac0063bdd5d5292c04482e782e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or redirection mechanism. The presence of external URI heuristics and the 'PDF_SEO_DISPOSABLE_LINK_FARM' firing strongly indicate the file's purpose is to drive traffic to malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://laborke.ru/uplcv?utm_term=happymod+apk+download+100+working PDF link annotation
    • https://spacio.hk/attachment/file/86104289083.pdfIn PDF document text
    • http://zl369.net/userfiles/file/7384027888.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/mubadafamutawu.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/22303723138.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/pololazozilonibifizun.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/82898790801.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f3b81fa15---mivatojotagejavigib.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/pobelifuxo.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/161497ce83fbda---rokagipaj.pdfIn PDF document text
    • http://sjatupornservices.com/file_media/file_image/file/14110304036.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a9c94341a---68600637197.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/97555104345.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/tamibesajigebajidalif.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/22306647779.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/41997033710.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/badabonitusikuwo.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/papibur.pdfIn PDF document text
    • https://ubitanduk.com/contents/files/73671499618.pdfIn PDF document text
    • https://valleyrentals.com/userfiles/file/laponuloroli.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/14793959668.pdfIn PDF document text
    • http://scpt.it/userfiles/files/74995610598.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/tomivelekunezojaze.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/depunexakubiruravaz.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/patutuluzuforibufowa.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/xarebunaki.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_off0000b222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB222 16088 bytes
SHA-256: 0ef936385840293610f4283c7175c14b277609c818dbf85549f6af34812e36b3
font_01_sfnt_off0000da98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA98 10796 bytes
SHA-256: 6e28149ef4e6827ee349d83a0c006aa39de022289c8c8b7b04bb0bea51f20deb
font_02_sfnt_off0000f328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF328 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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