Malicious PDF — malware analysis report

Static analysis result for SHA-256 5163be828daa151b…

MALICIOUS

PDF

85.3 KB Created: 2021-07-08 04:34:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 80da7380b0abe097930d9349de048d87 SHA-1: 0e76f927e5ff8963d17b599c07a26669f41daa87 SHA-256: 5163be828daa151b82aa1c49cdf9982c4727adb5b301aa16300e6f7f40abeabf
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a phishing or scam lure. ClamAV detection and ML classification confirm its malicious nature. The embedded links are the primary indicators of compromise, likely leading to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608032fc3bc72---89737679224.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/fa88218d1304baabcd26b113b4a157ba/50712596032.pdf
    • http://llux.vn/uploads/files/8339385542.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987f98e915d---kuwite.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2c8c57eea---2390101841.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160977530ab949---mavimanuviseput.pdf
    • http://cropscipublisher.com/files/upfiles/file/tobuxiwugeboti.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/b2029a15b0c6e78269603dbc51f3b4c9/nowexomevovilukoreme.pdf
    • http://kuhomania.ru/ckfinder/userfiles/files/37954819206.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/747148052a7cd59cf5917c2adff11888/12890755569.pdf
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5789560393.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/ab972894074c3d339c5d2daf6b52d176/gebawawafajisuzasebo.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dffe1f3e64d---nikosegewipumiruxideso.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16085ecf078587---vopizameforogomaw.pdf
    • https://carlojans.com/cms/file/55515540101.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/43ea1d2c46c6dc33295ca2d40ea7901d/48756910220.pdf
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/fivoxidizuzad.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ccb238e6096---xinopepizeporevo.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c34d6f8b4cf---vurojekibot.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609260ffe4bb5---wuzijonevafuparovonogosek.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609416f71e9c7---26095572617.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160b575a2b8ca0---walonagogibutuxop.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826e87027aa---66799615258.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b656ca5f941---87937391542.pdf
    • https://burgas-remonti.com/userfiles/file/balelowuzimabazesuset.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160969a01a96f1---gevotere.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=doctor+of+osteopathy+canada
    • 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_off0000ebc4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC4 16792 bytes
font_01_sfnt_off000103d6.bin
348c61560040702160cd57fde46a977ef9ccaba4dd4e2412ef5a4db65f08eda3
pdf-font-stream PDF embedded font (sfnt) at offset 0x103D6 16856 bytes
font_02_sfnt_off00012f42.bin
95da0a0c5ef7874a62e4c7c1c59ddb76b0ee180e2db97504083139526ae329a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F42 10696 bytes