Malicious PDF — malware analysis report

Static analysis result for SHA-256 2800957e12045c5c…

MALICIOUS

PDF

95.1 KB Created: 2021-06-30 10:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 691e14c4dadb3a6fec55c69635b2738b SHA-1: ebb7ee53ec66add0ef34f6313461a96f1266ba3e SHA-256: 2800957e12045c5ca81244a78ccf4be8c3abe90e671db45cbce726cf0a71af57
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/cqjr57r1sa6eotc55g4u16kmst/75102075516.pdf
    • http://industrialdevices.in/uploads/83189262040.pdf
    • http://hieuchuan.com/upload/files/bigizofutalomuzobipiritif.pdf
    • https://al-wesam.com/userfiles/files/zefepuvus.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/4cb220911d4d214bea1e7afde6253599/kebapiwodopivizonazexu.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/2bqjbidv85g0rp6o8imntjl9f7/72283524006.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b7cbd1e20---99036995284.pdf
    • http://jpbullies.com/clients/2/2c/2c827f09d77a589c2c5c7da8c033a3f4/File/nodakoxifogidorikilawofok.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8262bdc881---72573222890.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098baf954360---nedevojuleb.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5731664f70---rogopiforotalobanowazuz.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/a7hs0dsrftm6tvfmrtjo1r5n4i/tedozogabewatimo.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16076add914d4a---vuketumowuga.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/ukkdo828j6unq28mm4o460nuct/vokurifimefi.pdf
    • https://traveletrust.com/basefile/traveletrustcom/files/29468845834.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c522ca11337---76908449834.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/rgkuoiucgrmtod9prmh1l59e2k/fevujupulev.pdf
    • http://www.jacenter.org/js/ckfinder/userfiles/files/10646593873.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/7c2a35f91f3666d29f0859594a2c3bc1/sufenig.pdf
    • http://muzeumostrowiec.pl/obrazy/file/88390630630.pdf
    • http://holycrossyouthministryasp.org/clients/f/fa/fa15eac34f6f8ef5a8ada011ffef1578/File/24160574708.pdf
    • http://www.motionmantra.com/userfiles/files/723422077.pdf
    • http://doorsatyrau.com/ckfinder/userfiles/files/1041159472.pdf
    • https://llsindia.in/FCKeditor/file/4718107324.pdf
    • http://rajskiewakacje.pl/userfiles/file/72346690676.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/2656852421bfb526a6ca32b574959fc3/49478619591.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8fa84822c---pivowanoxuwobolipafom.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=pathfinder+2e+advanced+player%27s+guide+playtest
    • 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_off00010fb6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB6 16792 bytes
font_01_sfnt_off000127cd.bin
d299ef2f39ce0c3534f499d6d2def1c3c11d67eab14eace6ee8c01a56f6b46de
pdf-font-stream PDF embedded font (sfnt) at offset 0x127CD 11216 bytes
font_02_sfnt_off000141ec.bin
6788858efb7af44abb4c9a654543c1d9b4f70ed471b340658f16624e401def04
pdf-font-stream PDF embedded font (sfnt) at offset 0x141EC 16916 bytes