Malicious PDF — malware analysis report

Static analysis result for SHA-256 b17d829b7414307d…

MALICIOUS

PDF

87.0 KB Created: 2021-07-18 23:15:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4f700c6062e04e0f20c1d113e29f57b7 SHA-1: f8a17ae28a4d7300bc5799cb0710f90a9410d766 SHA-256: b17d829b7414307da81dad54f06218007c07f1c7951d93229f6bd6238ec1be9c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of numerous external URIs and the 'link farm' heuristic indicate a primary function of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9729

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 http://falerisztika.hu/tmp/87927875699.pdf
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/c08bf938de8f77b3efe1f6947b7a899d/witosajamexodusuvunival.pdf
    • https://remoteyourstaff.com/calisma2/files/uploads/66786422925.pdf
    • http://attlas.center/userfiles/file/48405402975.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e77b2fcc4d3---12166931862.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/928ce6732ddad04fa44f5f465eea1580/4609725944.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160dd8bfa7c3a0---pifemewoximamawo.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a64933ccbc2---88849445296.pdf
    • http://ponderosaclassof1990.com/clients/d/d5/d5d19f6fc184e1fdd834fc62be9f1763/File/tufetikilexutupevoxarebad.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e7722a2544e---xuvekivititonefefozuz.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737a0bb32f1---wudolakirerabajotavixar.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608579678c340---warodelusewamom.pdf
    • http://smartcevent.com/clients/871459/File/popipojewesibazugote.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc30391710---bilajuxilejidenebexud.pdf
    • https://urbanlivin.lu/userfiles/files/5512631914.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4a625b9b36---mixolidonevugamuwajubuviv.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a783456759---zekugepiviwigoxepikimaw.pdf
    • http://vlajamo.cz/images/file/dawumajuruxefapoxifuwek.pdf
    • http://falerisztika.hu/tmp/16684436772.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947d8691ea0---62590978358.pdf
    • http://wefocusdesign.com/upload/files/34991239712.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/t98o9ffj5li9dj712g6ilila8p/zubewalatalaxisesemet.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0de69146ff---jorulemoxidovine.pdf
    • http://aliceinformaticasrl.com/user/pages/39815780319.pdf
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/0u1iimadv2um6dtf9ic0heunof/darapuguxokigabofisixiki.pdf
    • http://fitnessklub-impuls.pl/uploads/assets/file/tevukefu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=1997+sunnybrook+travel+trailer+owners+manual
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0c5.bin
a23717c93e76cb22a019d25c2d1c881dadbe0c98e7e74384b0b2e5f303cb3c01
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C5 16844 bytes
font_01_sfnt_off00011c7d.bin
7229470cec1a95b10bb4287ee240a2bdc5cd8678352cb8cfa7f76d5225487a0d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7D 11040 bytes
font_02_sfnt_off0001365b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1365B 16792 bytes