Malicious PDF — malware analysis report

Static analysis result for SHA-256 71fc3c93286be0be…

MALICIOUS

PDF

92.3 KB Created: 2021-07-16 18:23:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e5c10e45368c3a7dce6e446674eebfff SHA-1: 01f973f305128700cb4486e368d5b56c6f90abb4 SHA-256: 71fc3c93286be0be4137f24fd66b87bf0f311d0ae4fe37e32359e5f3aa7db613
156 Risk Score

Malware Insights

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

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 numerous URLs pointing to compromised WordPress sites, likely serving as a lure. The presence of multiple compromised CMS upload links suggests an attempt to host or distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9558

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://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/frq033uptjbugg7mqqos5o1e70/tubuxumijusebil.pdf In PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160719132cfaec---wuxixevalawumelirinepew.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/fa28a6c915903d568c383d3368705438/17778506075.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16073be91e5f19---jipesijixewujogitavuxu.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ec416f50a---zitolewekujudi.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d0555ae18d2---27507001795.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/mapamudejevotuposelap.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/49322046710.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/wugurilumasupo.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/7a91499bb0ad7dd4a67df8d96057b126/17902063721.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021060809195754.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099820657eae---fapilojotewofukozitizal.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/latajik.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16083b6caad96d---vemofukowivimotejewejo.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/nesenu.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/cf82e1794cab7d9cf2056f6e259699e2/49394968825.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/gikafeniruvomumunum.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/49299885662.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/30148087369.pdfIn PDF document text
    • http://alaskacounseling.org/clients/8/87/870ae3779d21e956d596131c1dd113ff/File/87505653164.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/dqrdrvbfi9i9ch760cdigc50gc/kedudim.pdfIn PDF document text
    • http://monkeytailranchdonation.org/clients/e/e8/e82116dd0b5861b0917add2a69208af2/File/deloxokuvixosuda.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/35f90098584a740ff2ed82bcac9f4f68/29292224365.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/3683611cdbc88ba68c2f0bc7b1e21e78/majalevakomevuladurup.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/34049okbhebmfojkhijo5ath3s/9868657265.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/32199826082.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=poner+in+imperfectPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E4 17328 bytes
SHA-256: c6fc380f87b96d57c519a558f23bfeb4316521c800f454cc64c8e39e2ec81bef
font_01_sfnt_off0000fc0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11426 10264 bytes
SHA-256: d473624404708cce3b62aa793c61ff7b8b80c666d213dcc749f7e1c370809dec
font_03_sfnt_off00012b26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B26 2064 bytes
SHA-256: 5221cc56e96b657ff7c15f49bf1fbf1b5222e15cd7ffd769ce953162a3e53832
font_04_sfnt_off00013461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13461 18716 bytes
SHA-256: 0ae6c58e178f5120193506258be84ca3e606383afda7b0975a4e34aca0e6c0fa

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