Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0fb129ccbba8bab…

MALICIOUS

PDF

80.1 KB Created: 2021-09-11 23:37:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 562782079b84a6ff1f1af5c72d6c50ad SHA-1: 54395daa2aa10a40931416416a1a7e1891cdb39d SHA-256: a0fb129ccbba8bab0e5355bc02ff8d80dd00a7ba47f90e3843e14326c3fcaa20
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, embedding numerous URLs that point to disposable hosting and compromised WordPress uploads, likely to redirect users to phishing sites or scams. The `utm_term` parameter in some URLs suggests a tracking mechanism for phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://cructi.ru/uplcv?utm_term=where+do+apps+install+on+android PDF link annotation
    • https://www.thaiahpa.com/flash/files/buvirijovokorovane.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/24394551032.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/lavepagok.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/18208806041.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/boxotadajozosiwamoxi.pdfIn PDF document text
    • https://xn--dokumaanahtarlk-llc.net/userfiles/file/pagifasi.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612eed150fbbc---38871513683.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/35241582130.pdfIn PDF document text
    • https://rrrc.us/userfiles/file/pirajeku.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/96694476799.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/30848965998.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/nilozedomatufetijuk.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/36944866338.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/sumedobedixijiwu.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/86628551563.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/virumosogosukawiso.pdfIn PDF document text
    • http://jca-t.com/fck_image/file/51350429596.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613349e4cf5b1---dabilinepezujebo.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/volaxunoseb.pdfIn PDF document text
    • https://preciseenergygroup.com/media/9270063717.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/42602393033.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138b8ca7a0a5---mudevonagunikuvatesinod.pdfIn PDF document text
    • https://lnpro.in/ckfinder/userfiles/files/16153895405.pdfIn PDF document text
    • http://fairway.cc/images/blog/file/zunemigutonidelofum.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/zugexadiwuwajunexiliwe.pdfIn PDF document text
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A6 10480 bytes
SHA-256: c6e4b3043d332fccaca887cf2f2b2b78e75e4cf30fab38ccdd6a08781f841a45
font_01_sfnt_off0000ee67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE67 17084 bytes
SHA-256: a57699b0398defa2e40e91137040ad26efc7ab80d69cff22ad0feeb17f4674cf
font_02_sfnt_off00011a96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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