Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0d991f7fe4b9b1a…

MALICIOUS

PDF

70.6 KB Created: 2021-09-30 17:33:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 87c866d22a94f106c62d22042b6ca8e5 SHA-1: dd65dee3cc57e0aeb5529e69b2b14cc9f9669435 SHA-256: c0d991f7fe4b9b1accc4d1f2c317d284beb2ff12bad1d19d547178f3ebe3a865
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample was flagged by multiple heuristics, including ML and ClamAV, indicating malicious intent. The embedded JavaScript stream is likely responsible for redirecting the user to external URLs, which are part of a link farm hosted on compromised CMS and disposable domains. These URLs appear to be designed to lure users into phishing or scam-related content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=transfer+files+from+android+to+pc+using+wifi PDF link annotation
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/xegiwu.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/rijiwarerafutujulekaz.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/nubabimajujuzimodel.pdfIn PDF document text
    • http://millionsdiscount.com/mo_images/files/munamalasegerunojumoruv.pdfIn PDF document text
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/tokosabuzeribafim.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/tebixup.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/90211210092.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/091906387391.pdfIn PDF document text
    • http://tridiart.cl/ckfinder/userfiles/files/12888928694.pdfIn PDF document text
    • http://cpils.com/userfiles/file/zarirasijupedeniviveder.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/74583115654.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/q6qc95bpumlhvduam5r69s0u01/dizenoxepunen.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/bnnkvvs2ugkl8cc6mue8nu0cp6/nawiweziwisawejajuguvi.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/22490804081.pdfIn PDF document text
    • http://pedraferro.com/files/files/87232203968.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/43975823525.pdfIn PDF document text
    • http://mobiliteit.nu/files/26234794973.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/208dcc46d450a9658f8286412dba9a52/29592130316.pdfIn PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/rupiwetulipezeteno.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_off0000adfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADFC 11112 bytes
SHA-256: e72b6976f6c56cf4aff7d88bf5cf30333cf71c508ee3c30dfcf13a15e4b8d52d
font_01_sfnt_off0000c7c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dfd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD4 17796 bytes
SHA-256: 8dbd0b594da7ecd437c15cf9aa2a93b818e243fce87d2aff0c36563a48de41ee