Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ff2159daacc4e91…

MALICIOUS

PDF

84.8 KB Created: 2021-07-19 02:55:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2f0ad60de4da5a34d5690b3f9ad77064 SHA-1: 39f3ef0da78a911210547185d5a3fed51504c3ad SHA-256: 1ff2159daacc4e918db212f35560a249ef80889e958fddea6bd26172d1f803c6
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites, suggesting it's used to distribute phishing content or further malware. The presence of external URIs and link farm characteristics strongly supports a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092f7ff5d9e8---320705794.pdf In PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/28131bd12b68bb6771436d0bd7d292c9/76875453276.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/pulogidino.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/3f5e46b4618a4fc3109dd1351010dd49/soketilagaj.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/39964543336.pdfIn PDF document text
    • https://victorybear-info.com/userfiles/files/dewijulukilatalimiluf.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bdd36aebd---xixafudod.pdfIn PDF document text
    • http://bawaniint.com/ckfinder/userfiles/files/dokisoxax.pdfIn PDF document text
    • http://brainerdhs71.com/clients/0/08/084bd9d902c6a1e3ee48703551c87841/File/xolejenukogirawinaxut.pdfIn PDF document text
    • http://jdhs77.com/clients/58520/File/39662590290.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8a060aff5---37575542192.pdfIn PDF document text
    • http://www.moyekolodin.com/files/xamitabatubofulaza.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a75423bb3cf---75685644074.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0bc260369---34812482262.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/dg94u6d838m003to9upgsj6i56/46805945744.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/24710524195.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160e943a5aa924---lewatunutuwaj.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/gulazavuxajinaloboxile.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/bitad.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/605ebb551914fc550d72aac33ce8afd5/jalixopesuzulaxutose.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/137139d29e82581d34f866a91e9cd087/netudopevepikijupi.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/4hi898htre0qg0imujab8pqoq9/47955584701.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+get+to+route+5+in+pokemon+let%27s+go+pikachuPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/e4b4ca36848863b0b98c52610954cb23/98886573308.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_off0000e58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58C 11260 bytes
SHA-256: 1f68aeaf4f46a26cdc12030c0c9cf11813fd26433269211ee29a263291f672e6
font_01_sfnt_off0000ffe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FA 17960 bytes
SHA-256: 59842c625b101fa13bcbba818aaeabb7c9a779a27caca8ed62feb54704064612

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