Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac70b35638234689…

MALICIOUS

PDF

79.2 KB Created: 2021-09-08 13:17:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 94aaa61e2f23fe34ae175821eb3df16d SHA-1: 145810dc59691c99db132244c9b04e2194c51a0e SHA-256: ac70b3563823468916bb6544252f5886dd8bf7a608cd4c589fc6ef9bd0a1de15
196 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to various domains, some of which are hosted on compromised CMS platforms, suggesting an attempt to distribute malware or conduct phishing. The presence of 'utm_term' parameters in some URLs indicates a potential SEO poisoning or traffic redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • 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://dampinggame.com/calisma2/files/uploads/93435941881.pdf In PDF document text
    • http://perfect-gallery.com/userfiles/file/10087998148.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/ad54caabccbb7cfa4a2448790e219e41/30811836503.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210904142215.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/guvedomisulubapopakipinim.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/gorebigejepazutusasonarig.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210902_125734_3735.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021090421585473499.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135d9a46dc38---68541930207.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/161360d9a16736---safiwuworafixagowev.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/18786245435.pdfIn PDF document text
    • https://masihpt2.com/contents/files/42278212232.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/5600925760.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/tixanigonawod.pdfIn PDF document text
    • http://kondicionery-pushkino.ru/upload_picture/file/jozogiwepopivesijad.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/jukipizivexowupese.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/bosuduj.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/jafudakuwipotinomolokijo.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613362790fd1b---41843144055.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/60375785171.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/tufiruzukolojabijuvinuzo.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/70909918681.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/rovisutes.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/votoxow.pdfIn PDF document text
    • https://mbzgogo.xyz/web/imgIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=netgear+n150+manualPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d28a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eaa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA1 10456 bytes
SHA-256: 823407560b6cac68d6c8cb7b1dac1d6d74807db84713b0d791a522ea3f5dbf7b
font_02_sfnt_off00010278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10278 17340 bytes
SHA-256: ef5853d6ddc5fe25b227c290c831aca656728c1f0d77c5693e214c9701b17b64

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