Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aae93096d7035b4…

MALICIOUS

PDF

81.1 KB Created: 2021-09-01 15:29:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6a3691d2132be92268038c678d46a2fa SHA-1: 34a87adf7c00859f9631f306079ee5455cc1505f SHA-256: 1aae93096d7035b40333c69971380f7aca5c7021751ecd20b4acfb5f04817e9b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://drafthe.ru/uplcv?utm_term=8+centimeters+to+inches PDF link annotation
    • https://jbdclothiers.net/emailer/userfiles/file/pivawakafulatu.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/d242rv384is502pddv10p95tq5/28437066218.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/86597113401.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/4a8e0e990626b91ebae6ecad56fe5335/12021814741.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9d52160a0---jaxevapikuzel.pdfIn PDF document text
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/95213753025.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/73485605209.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/tiroxizu.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/79297349833.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e67d41d824c---sowupoxomozuliturix.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/jusosikazurixasixekoga.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/37d4d355c515405a36ce79a041d3ae6f/tagini.pdfIn PDF document text
    • http://cn-noah.com/uploadfile/file/zinokobekimikupagoko.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/97216291998.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/26952330985.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/kijesagedevibonujumetes.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/214284929.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/vebibaziluxenaxunanija.pdfIn PDF document text
    • http://josephlillianmorrisfamily.com/clients/59960/File/42867821548.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c980849ed7---biguwopepinetixog.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2cae8ac00---73428730096.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/abbgfu77tgun3j6f2qj5q9bn35/60640053915.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/puradizijulukijebuponin.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_off0000da9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9B 17520 bytes
SHA-256: 93af6f92f9ed9cc7fc7af0f1ab0c5dbec586af01f129fb0f2c02fa56dc846e25
font_01_sfnt_off0001079b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079B 10396 bytes
SHA-256: 5fef4f0af44707e3a07600d40f6698e0701c3991d9d068466fb015210bd2dc29
font_02_sfnt_off00011eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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