Malicious PDF — malware analysis report

Static analysis result for SHA-256 28abcb53b4fec4ea…

MALICIOUS

PDF

102.2 KB Created: 2021-08-20 16:03:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 87e7aca620cf02b9670e5c9888175751 SHA-1: daeb293920ee03d6c3f9e8f89d650ac62a978876 SHA-256: 28abcb53b4fec4ea5719a435aa73be6957f9b40791ee7bb3e69d113e883444f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL analysis are sufficient to infer the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://queure.ru/uplcv?utm_term=questoes+resolvidas+de+analise+combinatoria PDF link annotation
    • http://symbioticlifetech.org/attfile/fckimg/file///20210516132551_80376570.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/74442712912.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/fital.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/46510242503.pdfIn PDF document text
    • http://permianhighschool1970.com/clients/e/ef/efee9fcbc667252fc4b649c8163d3733/File/kunetuwutofijeli.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec821106eb---murezukopunubekasisimel.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/wetuleso.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/e65fc2edfbf354d6c20a362e27b0ae63/41520978047.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a993b6cdfc---zizonumurizukalozosarepi.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210615021011.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078f09eeb9f4---zonoforebeseviginodobup.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/6e73257a719919672a057a9dbd3a20d8/zazupufisikunexinelerinar.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/3f152cd3062d6dc588c67b00c81a5540/94345125121.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/wirizetisiv.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/78249810275.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/pudunejenofaj.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c41fd311bd9---43334800766.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/47499187737.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/20474494644.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/cc2249b1b421da6bf2bc8ba93d6ed967/85070186675.pdfIn PDF document text
    • http://gr-chem.com/upload/files/87747292553.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/6ql8ds99jj4vli77h4kr0jj6ot/lebamabazozuretamukewuvu.pdfIn PDF document text
    • http://janyska.home.pl/_mjanyska2013/fotki/file/62694990040.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_off000129ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000141c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141C2 10896 bytes
SHA-256: 6e9f2657e39a1c69769fb061f62b09b64b27e303ca615ef9286ceed88ba106cb
font_02_sfnt_off00015b11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B11 17432 bytes
SHA-256: ab26ff137828aff9d313677c41f9bca32f010a28c2d8e5757d97e5133fa7eeb1

Open this report in the interactive analyzer, or submit your own file for analysis.