Malicious PDF — malware analysis report

Static analysis result for SHA-256 aff5a10f9f3247c8…

MALICIOUS

PDF

79.6 KB Created: 2021-09-10 10:23:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4128947bdce27a5996b1a791bc507125 SHA-1: ec7078baba1ca9af8d002fa261d3ca52f65131d6 SHA-256: aff5a10f9f3247c88a5054a62abcd6dbcdac8d7b23ef71305d128d6b5fcf5095
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with many distinct hosts and UTM parameters suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier further support its malicious nature. The embedded URLs, such as https://garglob.ru/uplcv?utm_term=snaptube+full+apk+download, are likely used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://garglob.ru/uplcv?utm_term=snaptube+full+apk+download PDF link annotation
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/3a9dd50af7da126d6dcbc7523a045ecf/34649461085.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/kotadeb.pdfIn PDF document text
    • http://kondicionery-pushkino.ru/upload_picture/file/971487289.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/xobekijotovufololidani.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/16674213238.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/napefavatowon.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/gevorukosoxawabemiwa.pdfIn PDF document text
    • http://plncse.hu/php_data/file/zaxovo.pdfIn PDF document text
    • http://sigmabhp.pl/userfiles/file/42142899423.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/xubofutezit.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139f80d07d8a---61485392939.pdfIn PDF document text
    • http://xingzhongjing.com/userfiles/file/20210904043335_2105847034.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/dirimuradoximaginid.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/5355975828.pdfIn PDF document text
    • https://cargoservice.pl/cargoservice/userfiles/file/dotofoxefa.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/27627083924.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/satovofamedemipivotaw.pdfIn PDF document text
    • http://parkingparts.com/Upfiles/file/47319306207.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4a1391c52---milagobekenu.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/90724217686.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/wodakinitakuw.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/68613207674.pdfIn PDF document text
    • http://rem-stroymont.ru/img/file/67400569774.pdfIn PDF document text
    • http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/73624906912.pdfIn PDF document text
    • http://neo-net.info/giganet/files/file/89695415657.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_off0000d2a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A4 17764 bytes
SHA-256: 7592ca7bd579e666f82c6a7b4c752da77d8f4aa2d2d6dd0430e8f0da1115d0a2
font_01_sfnt_off00010071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10071 10624 bytes
SHA-256: 4fba38127c7d9084787ca31b884b54b41bcdb5a07134c2ad08b55c06a3928b37
font_02_sfnt_off000118c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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