Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc4c21b94b5f4cc8…

MALICIOUS

PDF

74.6 KB Created: 2021-08-16 02:55:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 132f9026ea4dab2028af3bc22b00321b SHA-1: a47a2df37f364a96b3798d10049f70dc932f825f SHA-256: cc4c21b94b5f4cc86f779e60886612aa0c36c253a4a84ab5b976dad8a217717b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, embedding numerous URLs that point to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware distribution, aligning with the characteristics of a malicious PDF used in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://archism.ru/uplcv?utm_term=pearson+edexcel+international+as%2Fa+level+chemistry+lab+book+answers PDF link annotation
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608d431b8e5de---nozagotinoni.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/fanedikiguxedonoxad.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/batefusamiramofilo.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/c2d7248fde52c42757d4f2a1723cdb45/banarozagelejesivaguw.pdfIn PDF document text
    • http://gumberryoleschool.com/clients/33891/File/72052093842.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/jewerifivi.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/049a0d5d6ceb862620595c9ab1ed2b64/54224379623.pdfIn PDF document text
    • http://alaskacounseling.org/clients/8/87/870ae3779d21e956d596131c1dd113ff/File/87505653164.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/gimoxatuvuputofejikeworij.pdfIn PDF document text
    • http://7onseventh.org/clients/868256/File/23814277355.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dibotedemuxudokevot.pdfIn PDF document text
    • http://viewcs.com/partner/upload/dextfile/56085228664.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/99631789539.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/205234098.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/tutepulesaxubu.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/43062432642.pdfIn PDF document text
    • https://seeyounow.net/userfiles/file/30406138424.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/79528674159.pdfIn PDF document text
    • https://moolans.com/uploads/files/zuxesapokipawi.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/jusinowisakiroresun.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/a784758f5a7171c631ce7e3cb7a465bc/kewopen.pdfIn PDF document text
    • http://janyska.home.pl/_mjanyska2013/fotki/file/kovibawejabazixafolikaf.pdfIn PDF document text
    • 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_off0000c0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0FF 11268 bytes
SHA-256: af49ca73a784bb512b68d8ece0f40401b57c2333ec55680224f6923610f08cf5
font_01_sfnt_off0000db62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF374 15736 bytes
SHA-256: cf37f3f5db6b6a74a2bfcf9ee5ec8996ae730580e06c99cb94db03d2674f63da