Malicious PDF — malware analysis report

Static analysis result for SHA-256 1da5754482d281e0…

MALICIOUS

PDF

87.4 KB Created: 2021-09-15 10:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3a1fc94b42ee2000df7852c82d706650 SHA-1: 9bf98c3b048a243fa1ee415e77e596159c6d115a SHA-256: 1da5754482d281e0eb6e7deb485f5d37ec842008317ef09f6847f8dcf9447a3d
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as a phishing trojan. The document contains a large number of embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm or SEO manipulation tactic. The presence of a QR code lure further indicates an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://huntic.ru/uplcv?utm_term=list+of+android+stores PDF link annotation
    • https://okazionche.com/files/metowizirega.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419b662704e---ladazifijezobubelujoz.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161390581dd737---81537566822.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/ruwenupob.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/16149230052.pdfIn PDF document text
    • http://www.truca-taoules.com/ckfinder/userfiles/files/dejunesexaponilegoratat.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-04/210904121342922676bgf621cxh5py.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/venutowilofebefemawap.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/xulurupetiresolobore.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/34795417358.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/vitidaxutelo.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/c28c8bee030ea0c4ba3238cfe962d343/56719698457.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/tipizigijuzured.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/14320542043.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/3627677797.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/97643931832.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d53655c7d9---xopekifotegavonur.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021091121531591.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/59795941081.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/nigirejax.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/zojetowezenovazisu.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/fcd596ddf0d1781551ad084462817fe1/32313250418.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_off0000f258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF258 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6F 10256 bytes
SHA-256: 90627a02211d1eca58e73875ee4df6e6632f59f420827303a7cff5928c048ff2
font_02_sfnt_off000121a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A1 17988 bytes
SHA-256: 83e1bf8ea990e73c24580c06769307df2019afe9f6243491aaea2370b11a8712

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