Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fc10c38fc217481…

MALICIOUS

PDF

84.0 KB Created: 2021-09-15 23:07:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f1396656e63db8f73d251fb26af350ec SHA-1: 808b81d8042ce0daf1d7de7c22d25cd95fdae62d SHA-256: 1fc10c38fc2174812afa1932256e6b0fd71946697b19388de34b7b0f77f5f866
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. It contains a link farm with numerous external URIs, many hosted on potentially disposable domains or compromised CMS uploads, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://allytemp.ru/uplcv?utm_term=mxq+pro+custom+rom PDF link annotation
    • http://ebslang.net/_UploadFile/Images/file/tejamekopot.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/womusizanutafa.pdfIn PDF document text
    • https://agermag.ro/mm/file/putonezodulibikez.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161408e2895880---bamam.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/beloxadatebiruforiwo.pdfIn PDF document text
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/zixasurerijorisipozaliret.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/tuzetezafikavetid.pdfIn PDF document text
    • http://haitrungkim.vn/uploads/userfiles/file/89200552179.pdfIn PDF document text
    • http://metapolar.hu/tmp/sawitakozerakufi.pdfIn PDF document text
    • http://bushurov.ru/images/files/wifasun.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6db8bbc98---xuxorufegimiluzifas.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/53983505936.pdfIn PDF document text
    • https://voxel-avocats.fr/uploads/file/In PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/mevedutazikegepi.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/82502426136.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/degabuxajawozumugejabe.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138764eac99c---sobadodizuzekokuzol.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/6373703265.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/6158087700.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613359897778d---33381007368.pdfIn PDF document text
    • http://julianina.dk/upload/file/movekedemisojuwutavupar.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/tulogisowifixer.pdfIn PDF document text
    • http://s250801404.onlinehome.fr/img/uploaded/file/ginevinij.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF6 10340 bytes
SHA-256: 823440f3c7060386489cb60a866efa831856d33bce8e02c1263a8affa18f91c0
font_01_sfnt_off0000f553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF553 20144 bytes
SHA-256: 6504fed9597353efe8fa8abadfe9ef54e5560b0d2fa94815155364c83bfa2c3a
font_02_sfnt_off00012ab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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