Malicious PDF — malware analysis report

Static analysis result for SHA-256 d57d2b5021e6d6d9…

MALICIOUS

PDF

81.9 KB Created: 2021-09-16 20:19:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1374c612821f7789d7f52e2ab917d46a SHA-1: 0a949034a7795e151fc3bc6dc8938f6d1a49c97a SHA-256: d57d2b5021e6d6d9cd397f828d108a2363ec475482b2d18c4bafb0aedf94d5b8
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely exploits PDF vulnerabilities or contains malicious content. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, such as drafthe.ru and stagegator.scorchmark.com. This behavior suggests an attempt to distribute malware or conduct phishing by luring users to external, untrusted resources.

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=how+do+i+find+the+clipboard+on+my+android PDF link annotation
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/69987159353.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/bulokarezedobagafofatimej.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/kozotixulomu.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/vc2k1lm0rq0nls5isss64lrtk1/jojubu.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/71893575516.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/7518497949.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/3901345685933c775c08e12652236ff3/kuziretanox.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/sepudogewipasebopelegire.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/11530513029.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/fu5seen12bakch88cb7rjis438/dozog.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/10480174649.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136180f7b21c---3378998681.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/24293119350.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/bfc77d7281e4a0193d5183eb204ebeab/muvidotol.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/lusekoboxikodevoxo.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/7ovk8l7km5knj0ohv65e1n33oq/niwudowu.pdfIn PDF document text
    • http://medtravel.pro/images/hand_uploaded/files/xuliv.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/riwepuguwobunopazekekafiv.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/65899670998.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1631579728.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a5f9ea716---6735791361.pdfIn PDF document text
    • https://arerp.kr/data/file///zujogukenadigedu.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/92525272688.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_off0000d8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FD 18116 bytes
SHA-256: cf928dc75d267fb3fe6e7e728693fd5c45987933e2c925b8a5b6a0e3234df48c
font_01_sfnt_off0001083c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083C 11048 bytes
SHA-256: 4692ccfe2e2643f1d34b0e4c244c1347189e520341f4e46b7a8f975821f1d36e
font_02_sfnt_off0001217e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1