Malicious PDF — malware analysis report

Static analysis result for SHA-256 7837767ef9559d5a…

MALICIOUS

PDF

133.7 KB Created: 2021-06-26 08:48:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 746f5d8a6e18d6379b0ba95e5410e8ae SHA-1: bbd80334254c46ffb5376d73c1427dc953bae9a3 SHA-256: 7837767ef9559d5a0db3417879eabc6cc98125e16b94cc8052633e0b756d6527
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV. It contains numerous links pointing to compromised WordPress sites, which in turn host further PDF files. This suggests a phishing or malware distribution campaign where the initial PDF acts as a lure, directing users to compromised infrastructure for payload delivery. The use of external URLs and compromised CMS uploads indicates a multi-stage attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8250

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 https://ketchas.ru/uplcv?utm_term=not+in+accordance
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160861c9fa6393---guxaxosuverelenan.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160842afb7b416---7738264283.pdf
    • http://elma1.ru/!upload/files/nawaxo.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/a94619434942018029d72cabb069ec0b/ritifotusodiwuxot.pdf
    • https://pametnidom.hr/pametne_kuce/userfiles/file/gifejokudopome.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097a0f0c3673---suxuzutuwigozitalewulel.pdf
    • http://wooshin.kr/uploaded/file/148455497960a35ab33476e.pdf
    • http://alphasigmaoverseas.com/userfiles/file/wadidonag.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607beb2055532---83611747867.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/2hk7tmt4ub2mpbq3s7gmsdu344/vemexudamedubezawen.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/f784b41cf6012c2d5be19504bfc6ab98/50236620126.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/ra740f2bs1qbf22so5jsv51hf5/xibekonezexepew.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4dffc4498f---lenekejotidiz.pdf
    • http://dentalclinicbangalore.com/uploads/waruxevelumigixagisak.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b52ed861f---sukakudawoz.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/g0aem5t3hb7hfatb55cggfdun1/rajazelurababuvapif.pdf
    • http://candientuvibra.com/images/file/kutazasofuvexamibuzezatoj.pdf
    • https://etonbio.com/newsLetters/images/file/70479605071.pdf
    • http://wahluenfty.com/userfiles/74584944106.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/fadaaee0bec3b9d89fa5cd9781d0e410/dakikubopiruk.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160949290cf0aa---jixajafibuvirela.pdf
    • https://kalyna.ua/sites/default/files/userfiles/file/46905196925.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/9ucld84mfv3pde8ejjtn5iaikv/73532440549.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608205555277d---botidasiwazi.pdf
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/45574253750.pdf
    • http://live-lessons.net/lcj/web/uploads/assets/file/zoparupemoxuze.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097d0c9b23d6---57437344265.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00016722.bin
50a967cb7d9c679d0b00fd619a3c32fb2ea8d53a3b9ed13711eea40ca68d3fa8		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16722 30072 bytes
font_00_sfnt_off00012d95.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D95 16792 bytes
font_01_sfnt_off000145a3.bin
26340d48718831fe7e8f93c31c471cfb91a7eaf950e9b1b42793a94109e92ae6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x145A3 10228 bytes
font_03_sfnt_off0001a2bf.bin
02e73f4789e3f806e07097d44acd1931b2ad13f6617c0315e3c19dd7e28e4ec2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A2BF 10128 bytes
font_04_sfnt_off0001b975.bin
84344f72d937cec6803f2504f3a45da149c31be1309dc55e11906f9bb80bd651		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B975 34400 bytes

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