Malicious PDF — malware analysis report

Static analysis result for SHA-256 523ddc5e74629282…

MALICIOUS

PDF

88.8 KB Created: 2021-07-07 09:43:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 573b112723b4fa57bfce28e2acaaadf6 SHA-1: 73e9f5cdebcc4926ddace6b76f85668a973155f0 SHA-256: 523ddc5e74629282fab6339090b51d44b0fb07a61d1e8d7b4fcfa3a4c9ec5530
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs pointing to potentially compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of 'LOLBin token sequence in document text' with 'cmd6f4/98066872997.pdf' and a URL pointing to 'amirep.com/wp-content/plugins' indicates an attempt to execute commands or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://krisoc.ru/uplcv?utm_term=change+powerpoint+to+portrait
    • http://446888.top/userfiles/file/16106045507.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/l3dq62i47gsgh85af6t2kcoqql/ziwuradowokazevujep.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b759e704739d68902372afba49f1c782/leleforasogadexi.pdf
    • http://allaboutdowney.com/userimages/guxoxotuzowu.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16086550f4f9c4---30749258323.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/3693f6f0f24191625f2df48693fc04ac/jatagujatimopudosoto.pdf
    • http://cgpreceptor.com/ckfinder/userfiles/files/kugopixufaremevoz.pdf
    • http://hasyo.net/files/file/1420737923.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab696e205ce---lixebovusur.pdf
    • http://rheinmotel.com/userfiles/file/79258820065.pdf
    • http://svsteinfurth.de/radsportfiles/file/6928599936.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/hdlq44qohoc342ch6u3ocmd6f4/98066872997.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/20b18bc2ea445b6a126f39d692b5d87f/pobufeloguzunesineg.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/a54f3b237f17937196306f73cef4d981/69945482582.pdf
    • https://webmenuplus.com/images/file/gafovirikigewiwetodelan.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c52e0788566---kusisolitidiwugagivakoxom.pdf
    • http://wsm.hk/images/uploadfiles/file/52758218440.pdf
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/3hoqttc6ggv4cro37e9fohifh3/nexuliva.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/gqokp2vl98bb1glilmd7u1famg/88910039245.pdf
    • http://ventilatoryzlin.cz/images/file/rinibisoremobitirez.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/8c553fe205e78ce724046d224d0b509d/69059385046.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607813a887a46---tedin.pdf
    • http://mfcwestenkwartier.nl/beta/userfiles/file/79094763790.pdf
    • https://amirep.com/wp-content/plugins
    • 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_off0000f77c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF77C 16792 bytes
font_01_sfnt_off00010f93.bin
766218a5e0699a081b20d334d8992d5ec33e9af822e3f7c553619e62c2f9faa7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F93 10436 bytes
font_02_sfnt_off0001273f.bin
cd4c43bd8bb9f10a1b4b856ab79ea5994ddee4f27b3a66012c6c7f7a75945872		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1273F 17832 bytes

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