Malicious PDF — malware analysis report

Static analysis result for SHA-256 67a15ca5c84e1b31…

MALICIOUS

PDF

88.2 KB Created: 2021-07-01 15:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 01028942ca3ff66aca39e5089afe81b8 SHA-1: 7765c707d473640b6d372c334cb4c38bb8e907ed SHA-256: 67a15ca5c84e1b315e7872f84d7c27f0a7d389a033f00f70f12c94a4ce29dbc8
104 Risk Score

Malware Insights

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

The PDF contains numerous links hosted on compromised CMS upload directories, indicating a link farm designed to distribute malicious files. The presence of a visual download button lure further supports the intent to trick users into downloading a payload. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/697acdbbc216f25641765797d5742adb/42446676380.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/2fed22878105cd6bc546ba95c9f228f5/60433648226.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8870393d9---98031072190.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e12bc7cb5---dakufuvidagefimujoxa.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/eiedhi3qcodcolnleqq7qhnqvr/zepivosolugivaxuse.pdf
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce89ec7baf---dulebegowovifut.pdf
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/6542d55e6257f144af8bfc68473ada1a/norejiwotewuminosezu.pdf
    • http://svsteinfurth.de/radsportfiles/file/92088345345.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/f1ce8af9784a27f005667b6f25a0a258/zojunejanegewab.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/m4tf191838t972lb0kocv6ijv1/xolerubowifivozoreba.pdf
    • http://shqinze.net/admin/upimg/file///pogab.pdf
    • http://chia4kids.ru/ckfinder/userfiles/files/74619926334.pdf
    • http://turagent007.ru/userfiles/file/sulogilaguzo.pdf
    • https://mytopics.it/uploads/file/pederaxuxekaj.pdf
    • http://cn-polylysine.com/d/files/kidabuwetodupijan.pdf
    • http://menloathertonhigh1980.com/clients/6/6f/6f83464fe0b13873896cace574d4baa5/File/3729838934.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a77279c2b---lebebilirabon.pdf
    • http://whitefamilyreunion2020.org/clients/4/4c/4c64578d40ee165aaf486c9a1ef3309b/File/7001812381.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb48b8d0b3---nenofelofizemagutaxu.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/1f406dcd5f2f50268dd713abe5393ef8/66609462022.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f28a448fc---dolesapu.pdf
    • http://bloomx.com/sites/all/sites/bloomx.com/files/sumatenezenisat.pdf
    • http://abacusnancy.com/userfiles/file/77052271719.pdf
    • http://susanirvine.com/clients/82887/File/25667350220.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/ktppi06hj1mi03pju24psfveo0/bofazosaguvexufemeguget.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=gta+iv+download+ppsspp
    • 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_off0000f578.bin
f36348705a6bfcb06e88f9a404f3496e99e1f9a5fe5a03b8ef71fcb126604a6a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF578 17876 bytes
font_01_sfnt_off00012446.bin
a99767c3377fa10b021c7649aad4243d10f1bf186acd73ec1103c9d648604b3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12446 10344 bytes
font_02_sfnt_off00013bd2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BD2 16792 bytes