Malicious PDF — malware analysis report

Static analysis result for SHA-256 c28c2d31a02165e6…

MALICIOUS

PDF

82.7 KB Created: 2021-06-28 15:22:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dba6f1a069fad086a34f565d5232dbf2 SHA-1: 819e9ece0b3282fbfc19151da0fe1058cfbe7bb1 SHA-256: c28c2d31a02165e62f9d22ac6f435e5468fdf07717ba419c2d68b3fd8c457a22
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary URL, https://allytemp.ru/uplcv, is likely a landing page for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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=m+tech+thesis+in+power+system+pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944d0af1c14---42649928981.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/0l64pd8dk1nsvm0mif2mq9j0kq/kibawi.pdf
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3828b09e0---jajusowiko.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a35f88619---43081806526.pdf
    • https://alutat.com/data/file/9354538991.pdf
    • http://hit-air.pro/ckfinder/userfiles/files/96906210294.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c10b7a9e64b---xevugowirisakana.pdf
    • http://fitviewer.de/files/file/puxulositerujo.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739edaf0c5a---xijibamoruladoji.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd978211f2---62386588091.pdf
    • http://dgxzz.com/uploadfile/file/1935641462.pdf
    • http://qtjdb.com/UploadFile/2021/06/28/file/20210628_032055_107.pdf
    • https://alshamiltrading.com/alshamilfiles/file/98629069532.pdf
    • http://stylowa-pss.pl/userfiles/file/50431897134.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607489aa94e6d---xutavawuxisesi.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a76288e514b---bomelevozoma.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/95f79d0861ff01858f0b0b410e733386/85275905723.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/4l4ricrtdkq0bec0r5qvhcle8t/87393689819.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608875152ec0c---33200847690.pdf
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160706b344b7aa---70758142756.pdf
    • http://vanillasky-ch.com/images/files/82077604250.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/f5beadf63b34947ecc56b8d5e439f69f/75534145888.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e260.bin
c9c32c7c939ce2e047fde87b3f21826a6b2a50b1685e341f587a585a61cc3811
pdf-font-stream PDF embedded font (sfnt) at offset 0xE260 10872 bytes
font_01_sfnt_off0000fb64.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB64 16792 bytes
font_02_sfnt_off00011376.bin
cf355d914706fe6b5a4e393f1dad694bf116f54dab0df3ca1c6b199ad06f8830
pdf-font-stream PDF embedded font (sfnt) at offset 0x11376 16316 bytes