Malicious PDF — malware analysis report

Static analysis result for SHA-256 f706047c7fc825b2…

MALICIOUS

PDF

82.3 KB Created: 2021-09-24 11:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 675e18d92a0e0565b2859f1e7cd384ba SHA-1: 2687ee23900e187d6fecff1a04876c2fd37bbbc6 SHA-256: f706047c7fc825b24e7eb137757dae206f19cf827c47762b64bd18251dcfcbb0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection. It contains a link farm pointing to numerous external URLs, many of which are hosted on compromised CMS platforms or disposable domains. The presence of embedded URLs and the overall structure suggest an attempt to direct users to malicious content, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://ketchas.ru/uplcv?utm_term=inviare+mms+con+android PDF link annotation
    • http://sdes.in/uploads/wepinobenadetud.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16142cd1fafce0---11093884071.pdfIn PDF document text
    • https://incense888.com/uploads/files/202109022233184118.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/17173938239.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/92368986349.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/5368529002.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/8be5fb0ff673ec2b43876c3d404f7de3/bewugadelile.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/xefusaviza.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/9aa904dbdb9c66bef1939e3d1a21abbf/41190204118.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/tapesowunejojitoratana.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613413b1c80fa---52764361281.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/seponujarebolojulagaxake.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/8018028180.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/fabugiv.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/70344971744.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/xunisixo.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/dedofugidelobatikaxotizep.pdfIn PDF document text
    • http://egitara.com/upfiles/files/18946697762.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d018870f1f---67871888019.pdfIn PDF document text
    • http://esistore.be/userfiles/file/99395722817.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/gimogizutatudi.pdfIn PDF document text
    • http://bigbulkbags.com/survey/userfiles/files/nepuzojidupegigiwaluw.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/50054647226.pdfIn PDF document text
    • http://denetimmusavirlik.com/userfiles/file/23670537022.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_off0000de42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF659 10404 bytes
SHA-256: 97c5f032eaae92d4214c897914dc4e25d57e08b484406bb98e01a26bcd12f29d
font_02_sfnt_off00010ddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDD 17568 bytes
SHA-256: a91ab47dad63d082fd1aee54096ab976e97ead1669e2c692640cb39793780cf9

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