Malicious PDF — malware analysis report

Static analysis result for SHA-256 32cf41f232c82509…

MALICIOUS

PDF

85.5 KB Created: 2021-06-28 18:15:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 609dd491c7bbb19cd73582df6a0bbf79 SHA-1: 02097db4ed583feab5a3965ce6faedadafe413be SHA-256: 32cf41f232c825096149d86c381bb915756268a723ca66cb910e1dfe6da85388
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it is likely a phishing trojan. It functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting, designed to lure users into clicking on malicious links. The presence of multiple external URIs and a link farm structure strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://maychamsocda.vn/images/userfiles/file/90729496218.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/11f9d875bfc99fc2506b77fffc869d7f/96443167134.pdf
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/iuj8c0oh0kr44cmqib9eeokfs2/duwemigilogim.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/ub1t788s0mls5vgkikufjb8qnl/wiwurozanuvuxuraferaki.pdf
    • https://alula.com/wp-content/plugins/super-forms/uploads/php/files/de4d31b71e58ff84543615b480ff7c9e/17761314329.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5cc65be744---puvobikinupineti.pdf
    • http://fernandopelosini.it/userfiles/files/bodaxesagigog.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d49930105a---gutexoxavoxu.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/7asape1qae4cgu9kgq93vq7gns/supanoluzokinimoxufixa.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/9bacfd54039a14754087d353bf74f3a9/jowilujuparibezoto.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/08cb5ef64ad439cb7e72de184afbe285/99949243607.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/3cc2ba9d3dad7e9e9f499744ba6cc2ea/64060362922.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160883973f0176---88204208719.pdf
    • http://alphasigmaoverseas.com/userfiles/file/80203227102.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/153b0351d6f08c4fdd5eefd9b7b19614/suvizorumibuvafedaw.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d8d507a30be---sojifumozadosakugo.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff098b2ee3---97071646892.pdf
    • https://itacademyindia.com/ckfinder/userfiles/files/82686342591.pdf
    • http://asianmosaicnyc.com/userfiles/file/nerezarurogusajotoxepozoz.pdf
    • https://mytopics.it/uploads/file/tutarojumo.pdf
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/bde6548a889f452352a9a0660577bf49/notej.pdf
    • https://bawwabatrizq.com/userfiles/file/jakuvet.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/b7gpk98kk1ma5u25p8ipvkoslv/fijekenozisonovi.pdf
    • http://cukiernia-waltar.pl/qcms/userfiles/file/44743973768.pdf
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/nevudipupunivipuxe.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608aaae75c864---51960648021.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=video+star+apk+download+android+2019
    • 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_off0000e9f2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F2 16792 bytes
font_01_sfnt_off00010204.bin
ec4cc218e0b478e0e60c1e142bc0f5654aa58403164ed17abc736741295a7dc4
pdf-font-stream PDF embedded font (sfnt) at offset 0x10204 17348 bytes
font_02_sfnt_off00012eae.bin
f4bb86bb90ee62a66e0df4253e65cb909426abc51dd4d3002dbdfc4748b8992a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EAE 10996 bytes