Malicious PDF — malware analysis report

Static analysis result for SHA-256 53961cd72a8cd5f1…

MALICIOUS

PDF

108.7 KB Created: 2021-08-12 22:43:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0405c521473f27a3e0ce5a539bf48a52 SHA-1: 336bdc7173ca8e79c482a2f1d8c45eda60a082ff SHA-256: 53961cd72a8cd5f1b09e54a5feba0cb05fbe54e293d27250b958886b6471f1aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites and link farms, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of these link farms and the nature of the URLs indicate a likely phishing or SEO manipulation attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9881

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://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/8ae6df9e0503eb49c8a3e0396ed6add1/99549406495.pdf In PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210629230311.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/0310qmolspdlf84eii9r61deu7/xinitezakisevewilo.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d22dbe0886b---57820697486.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/xakunezozovekijolaxusak.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/82351394872.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/43867654466.pdfIn PDF document text
    • https://mayurherbal.com/userfiles/file/10867199363.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/2f2544771e8debddd7cb84a741194ba2/bidanutujem.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c96291e919f---kujexebokojuvov.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b42d8423e28---zopepovazazexo.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/67639aa8c00a75b5ce373d7d658716b4/88635726740.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077b29f7ee2a---74212778755.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/su0781hf36puknqdoqgb1onl8p/sevarebufugexesufevagida.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff7f70d1ce---tarunewawilulumodetu.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768d5cabea1---vipuza.pdfIn PDF document text
    • https://thietkevuphong.com/uploads/image/files/17460089727.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089bb17d6ac0---kimanafenululekimip.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/bm8ajkh480nluuq1jcu8dk02e2/wedafukuzebusez.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/a2ec86851bf7aa62c6fbff8795c1924f/mizisipudiz.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072a3e21895f---85548700466.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/tizibujijud.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/q6qdra7s4ts1hoqqfuoi4rf498/86185205721.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099d0263da36---25758047435.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/n4rq6rmnk9k1kojatkeipd94b3/feradabav.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/9l8ard9vvai8729jq3mle3tb69/repolavelulapiku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=mega+emerald+x+and+y+cheats+master+ballPDF link annotation
    • 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_off0001449c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1449C 10956 bytes
SHA-256: d86948479b703aadff0e023eb1526b4c8ad3e0fec8693b6b8a63751147403861
font_01_sfnt_off00015dac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000175be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175BE 17416 bytes
SHA-256: e8a8f5dc5daa7517db3949c9461a94f88d7fd8f9c4a330ff33d0a3748991c68a