Malicious PDF — malware analysis report

Static analysis result for SHA-256 157d60f833d425fe…

MALICIOUS

PDF

74.2 KB Created: 2021-09-08 06:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2a200cfbd8d38981d9e97eaa9ea66940 SHA-1: b032fbf77b33e7c5c83514dcf99dc89b95c5dcc3 SHA-256: 157d60f833d425fe88037fffcea754724c8f9ee37b3a3c7055457ed6f0ea67e3
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://drafthe.ru/uplcv?utm_term=electrician%27s+guide+to+fire+detection+and+alarm+systems+pdf PDF link annotation
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/nufaf.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/42261783922.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/414583a3ab0f3c2b463fa450ae8d7b19/disuza.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/3126719460.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/96528246257.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/728hrtt0i3l8bv6j27f96j43l5/xiribetetezabamimoroka.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/98840655021.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/94603343556.pdfIn PDF document text
    • http://annabarons.lv/files/files/towopinopodol.pdfIn PDF document text
    • http://bige.vn/uploads/userfiles/file/nimiz.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/904b001293e359d94ce4aff14c5ad2e0/7385754294.pdfIn PDF document text
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/88657578610.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/49704935144.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d053b59cc9---zinokimupiritir.pdfIn PDF document text
    • http://ymmicro.com/files/files/pekepigupigazatazuvageza.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/47325608764.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/botuxevidazudopewozegasu.pdfIn PDF document text
    • http://allasclub.com/campannas/file/59569512423.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea024427be---69285836556.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/julutuwegelogaluxafekag.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/potafik.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/zofolibadidoduwikoxu.pdfIn PDF document text
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/33743693802.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_off0000be98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE98 11192 bytes
SHA-256: 802c096c95782cff89cec50a0288f17047aa6e52a46c3c5673920975011557f0
font_01_sfnt_off0000d89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89F 16448 bytes
SHA-256: 9da1534ddf9b4b239f7625c1d972a7b303cece7a51973b46a6fc4e2efb9703c3
font_02_sfnt_off000102e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1