Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f41108984136248…

MALICIOUS

PDF

101.2 KB Created: 2021-08-11 21:14:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 25283a02db6ec2398e96a932e3cd1938 SHA-1: 9f0914e94b60430ccdbbec333444f6c63209cfee SHA-256: 1f41108984136248a594fd33134c0d34bfb412d1137c57cde92b5797b6c54dfa
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised WordPress sites or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF designed for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://smidgel.ru/uplcv?utm_term=mini+english+bulldog+breeders+in+minnesota PDF link annotation
    • https://faceless.me/userfiles/files/sotixa.pdfIn PDF document text
    • https://liderpin.com/calisma2/files/uploads/xejujejewusirixina.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c053397c9---puxeduduzavazevikix.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/buloduraxekaderotore.pdfIn PDF document text
    • https://spiuruguay.com/ckfinder/userfiles/files/bevejajepom.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16099e3c84d5d7---90823946470.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/70931403379.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/68875530594.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cbf9fa350e9---rusobupenobipuxudogap.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/sererugufagukeposujapemap.pdfIn PDF document text
    • http://partnercable.hu/files/5258820898.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/17052102761.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/sijakabeba.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/04844ede50dc36d7a484907c5a84affd/96567368156.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1608038780f2c2---88048321163.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160fb5f0abb38e---napokejogelaxajupofufum.pdfIn PDF document text
    • https://groupunsur4.com/contents//files/polunabomiwetigejudogo.pdfIn PDF document text
    • http://beiks.info/public/file/58769232623.pdfIn PDF document text
    • http://ntrc.biz/clients/f/f0/f0759d16aca5b3dfc9163ee994587b7f/File/20992845014.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/43712093281.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/6d8b0a3f314abbcfba364c87c1f1b9cd/figabuwisavuxonulatu.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/wozowoxamur.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ae740df81---62625857814.pdfIn PDF document text
    • http://ckpak.com/fckeditor/userfiles/file/92908938905.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/337591203.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_off000126e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013ef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EF8 10928 bytes
SHA-256: 14d765565a206e2c141bb94b0b308c1eef23cf2b6c16b85375315e290bb89ddf
font_02_sfnt_off000157d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157D5 17084 bytes
SHA-256: 6f5185c827fa4b86cbfe128ce8b33794a73c1378fbd631b7834af0218d6b113a