Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6318b405bc9af0c…

MALICIOUS

PDF

82.7 KB Created: 2021-09-10 10:45:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b71cfa74be2f882cd40dc4a14edb548a SHA-1: afeaeb386fc5c41a979ef56274ae3eb59dd9aef3 SHA-256: c6318b405bc9af0cd6b5f81fccc842fdbaa3a1ba12cebc77f9a4857bf6e87a9b
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body was unreadable, but the overall structure and URL patterns strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://xn--38-mlcqjbufcz6h.xn--p1ai/userfiles/file/bagababumewati.pdf In PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/muvikoboj.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/74153718155.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/79805944961.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/35954440592.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/zaxitogetevelitoka.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613244602fe04---nazojomot.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/babixuraporidosuxewabe.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/2439542258.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210903070353.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/84402994661.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/uvcr4oeklq2cvfpi3e3golo1qk/19863683525.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/midafopol.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/24271815500.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/zetuz.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/duguf.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d62527354---pozoresazexizakaza.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/jonakog.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/waxina.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/81636844523.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=what%27s+after+trillion+in+numbersPDF link annotation
    • 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_off0000dbbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBB 18788 bytes
SHA-256: f30394046bd5f21bbac454c419bbba28b412d574076312e261fe0317398f738f
font_01_sfnt_off00010cb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB6 10748 bytes
SHA-256: ba279b30bd16c723e0487be47fabef454e1bc8a13faea2d1ebada82255ecbd4e
font_02_sfnt_off0001254e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1254E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1