Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcf14bfcb12858a7…

MALICIOUS

PDF

83.2 KB Created: 2021-09-17 11:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4fdaca7113d8ad3f6052d723fcd66e1a SHA-1: faa673ecaa9bf887c5f844423d8a94623af38c62 SHA-256: bcf14bfcb12858a797f89768cad0b60b6ec528176f2940c36c0d9b5ae1974751
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to exploiting users who click these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://discus-rus.ru/upl/file/54154753955.pdf In PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/fiben.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613daf6293a46---73712770339.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/8016307918.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/nuwovuwerelifuvofeve.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/runexutamuteketan.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/95512780600.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/11026027266.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/41878968206.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/95196821229.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/38649108034.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b64398dcc1---jedapo.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/beredifulig.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/93120040648.pdfIn PDF document text
    • https://o-dance.com/upload/files/sadidugo.pdfIn PDF document text
    • http://steakpluspizza.us/userfiles/file/43194610549.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/84144006543.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/12686532766.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/75385115444.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109150653484661.pdfIn PDF document text
    • http://modern-pro.ru/files/file/28185317512.pdfIn PDF document text
    • http://hidramaco.com/files/files/rekunobutetaxaromope.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c80eae1ce5---saboziwojedozagoxofuleko.pdfIn PDF document text
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/4653991533.pdfIn PDF document text
    • http://phutungototuanphat.com/img-tvdl/files/giribukinekiwif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=preposition+worksheet+for+class+2+with+answerPDF 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_off0000e0ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AD 17532 bytes
SHA-256: 2c31a7de6cae12c99dc0118184aaff7cd34234eaf48865f2d8fe4d2b3b44e6d7
font_01_sfnt_off00010e1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12633 10876 bytes
SHA-256: 1d04378b7cd7222b0f17bb441c741d1b2e3d08d713ad8e1de109e6cb3ccc989e

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