Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d365ab659ac18ad…

MALICIOUS

PDF

88.7 KB Created: 2021-08-03 04:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2c97b3b5bb7bb6431482bfb265177698 SHA-1: 910e6540f5dd813f11f812b0517ad4ad9a9b1c59 SHA-256: 5d365ab659ac18add1d2f8ff3a9714dca16b2e72f55a7a92118148ae6cf888af
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ClamAV detection and an ML classifier. It contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, suggesting a link farm designed to lure users to malicious sites. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.kymenhome-etsinta.net/tiedostot/files/nijiwiselomuraxi.pdf In PDF document text
    • http://aven.su/userfiles/file/73727254550.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/fizademodopesil.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/08798184562850f4b6fba4f9dbf00d24/92665745564.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/45928569803.pdfIn PDF document text
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/44469236708.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd2b1f29122---zotewipupajewofutun.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/fomjdlneqm68e3qihveuqqdh72/gitoliba.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a89ae3f3b52---ritefobozezowijatixa.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/0060f5587568e3a38f039c3f538acd04/modinovigowikepotukokom.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/sl30k3nbs7fingecprc43lk4s2/melukawilofuzedifafabo.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/6e89018af018419e64d870e0dd7590b1/wululuwepaxoborida.pdfIn PDF document text
    • http://www.toptehnik.si/images/bazipamojonafaboso.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609269d5508d5---bumuwuxedajom.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b01bf654b6b---voguxumirolilesekila.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add1b4dc73a---66053083578.pdfIn PDF document text
    • http://asfalon.com/__files/file/12238048467.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/9273057980.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/51856331661.pdfIn PDF document text
    • http://rilta.net/userfiles/files/waxudotowisob.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/tomisu.pdfIn PDF document text
    • http://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/91052681037.pdfIn PDF document text
    • http://protectakoteasia.com/ckfinder/userfiles/files/megitutolarolufo.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b21f2fba0---33611218519.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=introduction+to+machine+learning+with+python+andreas+mueller+pdf+download+freePDF 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_off0000f4df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DF 17256 bytes
SHA-256: dfea3d5944d7a722caeef471ad87d67ce90fdb83ca7a3b1ad7f53b1142cf0292
font_01_sfnt_off000121ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139C4 11320 bytes
SHA-256: f3acfbeca55ff6c9881597b22362f3ba5f89846116cd52b421a188b3784c61fa

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