Malicious PDF — malware analysis report

Static analysis result for SHA-256 c844099d71d2c417…

MALICIOUS

PDF

80.1 KB Created: 2021-09-19 03:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f5c0198c8931e75d7773974e8fb9f2e6 SHA-1: 66f0a8e76a31262635eaf9cae1d3f1eb45dcb544 SHA-256: c844099d71d2c417d10fb570ae69c561219eeeb24bfc70d82bc39c8ee95633ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of external URIs and link farms points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://garglob.ru/uplcv?utm_term=seven+deadly+sins+mobile+game+apk PDF link annotation
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff546e40fa---vutavukoxeramikigizok.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210914_EBF202D29C3749A0.pdfIn PDF document text
    • https://kstraders.com/userfiles/file/sogunaleferivikuziv.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/23849816350.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/3589979701.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/molutawu.pdfIn PDF document text
    • http://autofox.lt/ckfinder/userfiles/files/junulatujoselemafafijev.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/nasanuxitozetevoruvosa.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/37008573293.pdfIn PDF document text
    • http://hingliltd.com/userfiles/mobegeposizadezodi.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161467d3a901d0---xazugivotejiwumezi.pdfIn PDF document text
    • http://winso.tw/userfiles/file/fumakufunoguna.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/fenumaxogitevuwaragaroj.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/koniwiba.pdfIn PDF document text
    • https://daks-96.com/f/uploads/files/35376917401.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/mozatebexazi.pdfIn PDF document text
    • http://directopinion.biz/uploads/FCK_files/file/68829185259.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/21930608922.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/baponugevetatapotogit.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/sorerewotom.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/javuxezilexopavi.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/ab10c083854c4b4cac6dbe5bc882ea07/72791424428.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/rofemonipogimo.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/831120423.pdfIn PDF document text
    • http://tlumacz-francuskiego.pl/userfiles/file/fagijewixibane.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021090703511580554.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_off0000cd1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD1D 20332 bytes
SHA-256: b6b7370e1bdaffec91af95bad580ca883fb7ca70ca4615223e331798058f4e02
font_01_sfnt_off00010126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10126 11024 bytes
SHA-256: a233be0042ed122523e9085f346030d188acf7a1599bbb42e2a929dad6d88f02
font_02_sfnt_off00011a60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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