Malicious PDF — malware analysis report

Static analysis result for SHA-256 982895ae14b57914…

MALICIOUS

PDF

88.6 KB Created: 2021-06-28 01:08:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 796aa458310dc6c8f9dae7682a21d49e SHA-1: d16ce96b2d63ee109e56b7297c401f08fae408f1 SHA-256: 982895ae14b57914dc02a2632e94490a585014e3a826197f330c7d891af5d510
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites. While no scripts were explicitly extracted, the presence of numerous embedded URLs suggests an intent to redirect the user to malicious or phishing content, likely delivered as a spearphishing attachment.

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://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079582bcdf9f---tafetesililexaku.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/rqcf2qpose2r5242id6jg7km4t/20809538860.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/68152a8d03b16499c80c492c84d7e989/mokirasarigalodaru.pdf
    • http://polskienarty.pl/data/aktualnosci_imgs/file/34692548014.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac1c9f3700---nafubadavavusabej.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ttuhmvfr1ikpm5tpha8oa6i4si/72905000733.pdf
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/424729515d5796225a0f6258cbc6ed8d/47398042800.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/6a4e8759d51f8bbb5138307ee4cfe655/sapejufog.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/0f8b75010376a7b534f923d52bc89872/rozutitoboxovabubag.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f9da4a394---10404069584.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/dup75t25irqssqpkab1eor3rbg/6569866913.pdf
    • https://motelandratecuci.ro/userfiles/file/55822685226.pdf
    • http://ghrnightinwhite.com/clients/7/72/721f26fb9237119891afe8d29dbdfc29/File/wupibexovakexakusexi.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/230b368193e6acefca2e63885e368f46/jajuwazufo.pdf
    • http://allaboutdowney.com/userimages/35239281715.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba8e0d1683---21026880504.pdf
    • http://richmore.kr/uploadfile/fckeditor/file/22147444614.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1607b83f368ab9---29176034326.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/2ugbuhsgj98jpg6tgiq8a09ftc/kajaketawigimorez.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/02822c8aaa420260f4032e6a341d47a5/63596049559.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d7fb70d0e3d---sogapugagufubaramopuranaf.pdf
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/c95982ceb6257c257d210eae043f288f/86734849352.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/k3949q5vq13uaij734h85nl00g/vekimaxopefakixutuzafusa.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9402e118b---fakimu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=fiscal+monetary+policy
    • 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_off0000f6bd.bin
c2d0c960f540b1b0a98d5151ae4770de3b11883dddfb0b71d939edd228d652e8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BD 10628 bytes
font_01_sfnt_off00010f11.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F11 16792 bytes
font_02_sfnt_off00012723.bin
9d6d2787dd9c971bfc83640011e55926301565cc24f5809dbe3729986cb4805d
pdf-font-stream PDF embedded font (sfnt) at offset 0x12723 17520 bytes