Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e1022403ef2246a…

MALICIOUS

PDF

92.1 KB Created: 2021-08-10 08:55:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c642dec286ec9a522d4341142cdcc866 SHA-1: 08c390f9569d1ac6215e0d548eb0d3a930cd4ac4 SHA-256: 1e1022403ef2246aee868d51a690d3fc4855171a4b701adc6464c976f508412c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external sites, several of which are hosted on compromised or disposable domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this behavior. While no scripts were extracted, the structure and URL distribution suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://fcr-fomentoconsumoerenda.com/uploads/files/vifizafonixazojuvukeva.pdf
    • http://eko-uklid.com/files/file/visuvovaratabamatajupura.pdf
    • https://vieclamxaydung24h.com/upload/files/xobaribixu.pdf
    • http://belloverde.net/emailer/file/mokajitexe.pdf
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/j0v58m7ssc5plmko5pof8830kj/lagiwawepub.pdf
    • http://kardelendalgicpompa.com/uploadfiles/file/28595871882.pdf
    • http://daotaonhaccong.com/uploads/userfiles/file/berefelogetasivodejuvefe.pdf
    • http://xecuoihuyhoang.com/uploads/userfiles/file/27384428073.pdf
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/71111789338.pdf
    • https://tempegaring.com/contents//files/93864606205.pdf
    • http://archerelectricsupply.com/userfiles/file/netojigosawopovu.pdf
    • http://langeline.com/ckeditor/upload/files/94466270213.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f640188b96b---narurelato.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/i8uti4r9kiobq124qe3jfo7kp6/26689438617.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093aaae9ddab---loverisujodavikeruduvaxul.pdf
    • http://lachina.cn/upload/file/jegokezemudov.pdf
    • https://ises.ca/phpsites/vertical_living/uploads/file/vexeretevilaleriz.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160acfba43efd6---74748896189.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730b94cb927---94638690404.pdf
    • https://menlopark.com/wysiwygfiles/file/fipera.pdf
    • https://efnnma.org/files/file/vevanijujon.pdf
    • https://besteva.com/upload/files/29515472644.pdf
    • http://a1-automotivegroup.com/upload/files/zibetapagozedober.pdf
    • http://kleinschadenexperte.de/userfiles/file/vexazud.pdf
    • http://ozanatalan.com/iboard/includes/userfiles/files/gifimoxe.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a267e29f3a0---84366133635.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=adjective+phrase+worksheet+grade+6
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001004b.bin
b46c06909a4be6b7e51e889f53bdb081d32a642652898ef37ae666868bfabf1c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1004B 17272 bytes
font_01_sfnt_off00012d2c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D2C 16792 bytes
font_02_sfnt_off00014543.bin
552f0e56cb73f8f646477fe389721100ff201ea662b323d83e2cb690d385d623
pdf-font-stream PDF embedded font (sfnt) at offset 0x14543 11168 bytes