Malicious PDF — malware analysis report

Static analysis result for SHA-256 747b16d19a89e3c5…

MALICIOUS

PDF

87.3 KB Created: 2021-07-13 23:30:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 20489f6518977440789e8ef1c45b6541 SHA-1: 2168073d4f0d2696cea9e9ae68731911f469d5e3 SHA-256: 747b16d19a89e3c5ada3b5d51799d62a3962268047d1fe05d91f24ab925ba376
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics of a link farm, with numerous URLs pointing to compromised WordPress sites. The ML classifier strongly indicates malicious intent, and the presence of embedded links suggests a potential phishing or malware distribution scheme. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document designed to lure users to compromised hosting locations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 5

  • 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://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c744ad5da5---bofaji.pdf In PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/23e0981e54f194ba33efd448a23c339a/70199758882.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc469e85ad---38434419714.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/mgq1vedepq7hq3dqicvjuu3ukv/67523365773.pdfIn PDF document text
    • http://teraval.cz/res/file/sosapufaro.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609adc2fe53ec---jamebuvaxudexomiwawitopot.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a08398b3c2c---2290982364.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/jukaxapera.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/chrkarqbnu0svkqq79l8nonnhu/67209826261.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16088e5640f386---56023624061.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/23573383451.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/5fbefc4452442b6727bd7e325d6970f3/64050421699.pdfIn PDF document text
    • https://uniqrelation.com/userfiles/file/zufiwomutosa.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/78533969731.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/1a4b40250ede2d33dbde55d51d1c9fd8/renikizefeferip.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/lq7gvcceb5sfpvvm72au9u9b24/90520621514.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/naranatajimuzuf.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e19de5d9e9---lumavub.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/268dqpv5utncdh3t6bclhuppi0/48228448739.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/96e47445d88a49d3330d9022ec18b238/kenisopuvoj.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/c1d440c09a37b3e05dcb359c7aaef32a/numojutubijinokek.pdfIn PDF document text
    • https://clinicscrm.com/img/files/zunojepemuwuwowodobewul.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/84b7a511e7223799950ef28c126ea2df/xivotasazuxoziwa.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d4d4abcd83d---miwogazowotumowa.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/paxida.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607490a416bf2---vifokep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=language+and+speech+therapyPDF 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_off0000f163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF163 10708 bytes
SHA-256: 0f0f90a9102e9b82f0b5457f9f1c59efdd6650c3b7a112ee4be86ccfe76deb7a
font_01_sfnt_off000109bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BB 18164 bytes
SHA-256: 689e51995268a583169449fc064e1570c169990060d6c793e531b17c4d598778
font_02_sfnt_off000137aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1