Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c615c1275b79b2c…

MALICIOUS

PDF

70.5 KB Created: 2021-09-19 19:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e08c9f65ee477198942dd0654e5828b7 SHA-1: b181a3e14ea832e9493496065d79cbe49778d2ef SHA-256: 8c615c1275b79b2cc08fe5ecf5e57b755215690345b0861bdb1ca0bf68af8396
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, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially harmful websites. The presence of compromised CMS upload links further supports this, as these are often used to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crewmak.ru/uplcv?utm_term=ram+expander+app PDF link annotation
    • http://royalwedding.jp/images/blog/file/80655850319.pdfIn PDF document text
    • https://eko-briketes.lv/userfiles/files/86337316827.pdfIn PDF document text
    • http://lejuriste.ru/files/file/4187255128.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/68413754735.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/94543830845.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/6626357384.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/fojilenasofuvuzetojapu.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/e1eeec0674dc9f6e3cd5df82b2aa7ecc/28023024644.pdfIn PDF document text
    • http://lecostationery.com/files/file/41897250098.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/riwigiberutefaxuxurus.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/63322903301.pdfIn PDF document text
    • http://mannaz.pl/userfiles1/file/vodubanoro.pdfIn PDF document text
    • https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/59704112229.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613faed04a0c0---dijusuvolomarumasuzenufar.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/70603584368.pdfIn PDF document text
    • https://telliogluhukuk.com/userfiles/file/rujozezo.pdfIn PDF document text
    • http://sbairs.com/datas/files/33641658655.pdfIn PDF document text
    • http://eva.am/files/36fb6f00153fb03d.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/72295391220.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/farupatonapajilikiregug.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6b83ad5ab5bcbac2910e93f733464356/buvakitu.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/ludidaxuwekixukofatada.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/30972265641.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/49170870408.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/bovevurowanijegijozobaw.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_off0000b4a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB7 10176 bytes
SHA-256: 146949d5c42eaa34dda4ea85acb06cf333aa3f20f111fc5bbb7ad3d225536c5e
font_02_sfnt_off0000e369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE369 16148 bytes
SHA-256: 6ea3cfaa8b72c86ce377f1d22cb2a4facbb86223fd0a3094f0f9945e4068c87f

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