Malicious PDF — malware analysis report

Static analysis result for SHA-256 2145af9daf2e0eba…

MALICIOUS

PDF

87.7 KB Created: 2021-06-28 01:36:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d9ae156ab0e98883dad0748b14deda88 SHA-1: 41fcfbb21b9376665cdaced855d7a77e2c1f4e92 SHA-256: 2145af9daf2e0eba788bcd2d49007ac2077a140625557e12b965653e41cf2226
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious phishing trojan by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised websites, likely intended to host or distribute malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating a tactic to obscure the true malicious destination. No scripts were extracted, but the overall structure suggests a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://abofahed.com/userfiles/file/mufimasaxid.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c051bd23309---82642787312.pdf
    • http://ledson.ru/upload_picture/febiwebiw.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ec2b93cb0---losimini.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b35594237e7---35691976297.pdf
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/7ea26033d85a713333d76cfbb7f85cdf/81199209868.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/b84ff08f6aa3b49c83a33935083a9bb4/14671973342.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/54e9a682ffda4d7fa71762cbdb000a03/58901576403.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b788cd694aa---15923936589.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078f835925cc---xaletezuvobolulusoralu.pdf
    • https://nabsangram.com/userfiles/file/bubulurovesebiwibigene.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/t0m4ucagbsf45n5fqrugu8e77m/50639333570.pdf
    • http://bright-inter.com/file_media/file_image/file/19793552280.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/69427729060.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/0cef8b1f389fd30b53ffcff22750d736/16431901984.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/23db35c56010ca1ec3c98da68a7d6459/zumufa.pdf
    • https://rybczewice.pl/userfiles/file/kiwutuzepisazefuxi.pdf
    • http://usateatop.com/_upload/files/97747912713.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/54t1b663mlrm8kqnrjfc1nm44e/fufunan.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/d3ln11evtluaeuumpggbusqrbq/jagoziwili.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/o1fpgungqiledaprq724c9j5g4/59091910720.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609038ab2a73a---wuvosupidexaroxefitujam.pdf
    • http://dgjinhak.kr/DATA/upload/files/202106200947473983.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/fnqrdb5r2pahp0ghu9kg9bm5g6/53709638663.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=mouse+pointer+download+for+windows+10
    • 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_off0000f50f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF50F 16792 bytes
font_01_sfnt_off00010d26.bin
a99b1a684d640efcd9e7d699cd508c2c41d18489c56909e39da16fe435650d06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D26 10844 bytes
font_02_sfnt_off0001266f.bin
127013983cf67a750a05656165b640b7ba36568727f04d04273e878cbdb7924a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1266F 16600 bytes

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