Malicious PDF — malware analysis report

Static analysis result for SHA-256 7caf20f63a115ec0…

MALICIOUS

PDF

71.9 KB Created: 2021-09-27 20:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 55913cbc218394fd8c619fdb01a334a6 SHA-1: ddac474448e2cc9fa81fdcc15bc3db4c12b3380f SHA-256: 7caf20f63a115ec007c1ce3367b8d86d3082e54244f66e8a6a9d1b61ed2f2990
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are hosted on compromised websites or disposable domains, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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=aynabaji+bangla+movie+2016+full+hd+720p
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/zinuvuresewezeziwog.pdf
    • http://ficfart.org/userfiles/file/62921414648.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416a97524a4---96189941913.pdf
    • http://zeguvietnam.com/uploads/ckfinder/files/xifufaguzogowanesijipore.pdf
    • http://dtyxbpzx.com/filespath/files/20210926081931.pdf
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/10077405681.pdf
    • https://vinasimex.com/uploads/file/81931175530.pdf
    • http://tgroupsrl.com/userfiles/files/tulalezajufefaborojisim.pdf
    • https://encoyun.com/calisma2/files/uploads/rapavumutopagiwuvekese.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/161410e4376718---63292546037.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146fdb0a0a76---12618101071.pdf
    • http://es-iyashinomori.net/yamituki-n/uploads/files/koxapolekowalixevonaza.pdf
    • http://ozdermusavirlik.net/userfiles/file/94555784271.pdf
    • https://tidurmalam2.com/contents/files/71033888883.pdf
    • http://gimhaejazz.com/fckeditor/userfiles/image/gexadaxixezuw.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/gufiguxulumenuwekeziw.pdf
    • http://pscemetery.com/userfiles/file/67096076193.pdf
    • https://thebottombillion.com/business_school/uploads/file/pakuj.pdf
    • http://bwc.lt/i/bakodos.pdf
    • https://girilawfirm.com/content_files/files/vorarimabinuzekitijapez.pdf
    • https://worldcastlive.com/userfiles/file/tazovuxupudujariwerikixej.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/5fff0495fde5f16d99d6a52f7b4496a0/vuwoj.pdf
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/97838133081.pdf
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/540001051.pdf
    • http://transchem-tech.com/Uploadfiles/files/femeverovevixus.pdf
    • 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_off0000b1de.bin
42b30e4f6d8656d054424ba66d864bbe7f9162b8ea07adb69c27488a550e1622
pdf-font-stream PDF embedded font (sfnt) at offset 0xB1DE 11620 bytes
font_01_sfnt_off0000ccfd.bin
065686f0b97ccf7cff330c16268726197080b5a96a30817959ee9dc6bd44f77a
pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFD 16512 bytes
font_02_sfnt_off0000f7e0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E0 16792 bytes