Malicious PDF — malware analysis report

Static analysis result for SHA-256 1009a7245772fccf…

MALICIOUS

PDF

133.2 KB Created: 2021-08-02 10:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 01753714c621392578194eeb48072326 SHA-1: 78ab02e29b0354b64cadf6ab10068f1bb3714b23 SHA-256: 1009a7245772fccfc4a5488969d8bf5ac9b622a6b775ccea85fc18589d37b054
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 WordPress sites, indicating a link farm or phishing lure. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acf29622026---meritevekuvakezuxoda.pdf In PDF document text
    • http://stolizstekla.ru/userfiles/file/30667688281.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/zirojegalusezamuxuvev.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210623054745.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cd4e93a6a---72123270081.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e92ab38d549---32809007550.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/xuturivotetexewure.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/24310753521.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/petamol.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/60b1b3f1d84f4.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/96047880058.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/tovoginevulanawavebi.pdfIn PDF document text
    • http://abpaluso.com/upload/file/69182260906.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/79db5e6852732c8a4d88429e1da3e233/paxuferitex.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/35177571089.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/10e38f9a45edbbce9d7d8a35cce03b13/93805952069.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/84e18a117a94373df057d43c2e1cd6ab/pigixigesufo.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/6e3824250cf4d7aa0598b7ac98a32c97/32867907535.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84ea33ffcb---93414782822.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c36abc51ac---51546094879.pdfIn PDF document text
    • http://builderall.info/userfiles/file/tixeruridupujagewukufozup.pdfIn PDF document text
    • http://zerosquareonline.com/file/22212680454.pdfIn PDF document text
    • http://dieukhactransam.com/uploads/files/35530508813.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/93086043792.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1627202988_ff3ffa756d.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=metodo+suzuki+piano+pdf+gratisPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off0001b11b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1B11B 18336 bytes
SHA-256: 38d62a4eb02e69787d2a03a7b2fce75906dc759b524aa4268aadc0400f065723
font_00_sfnt_off00017fea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00019801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19801 10872 bytes
SHA-256: 5bf8ff12cde2b457c1a94126b5767312d9ee3ca5629bd3666ba5f1da459dc7c2
font_03_sfnt_off0001ce21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CE21 21404 bytes
SHA-256: 8f859cf22292768bae94988787ab65141143a04ced5681cc39e3c4604c58fd55

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