Malicious PDF — malware analysis report

Static analysis result for SHA-256 20a31428bd9d910e…

MALICIOUS

PDF

89.7 KB Created: 2021-07-04 08:37:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3095f45d66aaecd5a3fe2b35dd65f990 SHA-1: 08e23a3decb174c28309ba8c16582e2ac0d5c6ae SHA-256: 20a31428bd9d910e1e183e3a9fb94cf2b3daac17dc8a610129aef0ac93731f13
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute further malicious content or redirect users to phishing pages. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607df49681c9d---35293144758.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160a49f9180110---31156068955.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/4ptodnlpumlkuhil3l0urm1hue/49319808899.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a84066705---92615745863.pdf
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/00a575304960e287669e304f28df8bea/lugenalagejila.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c111c894881---56922114374.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/n66bsv6rk9armt4hsalfiiptl0/buditalupixik.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/a5d68mlmglmufn28n7qittb5p2/70396414137.pdf
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/xuvevus.pdf
    • http://alliusie.com/userfiles/file/58573050348.pdf
    • https://ost-fogging.com/upload/files/94236087006.pdf
    • https://nhorizontours.com/userfiles/files/34273859328.pdf
    • http://stavebnevyrobky.sk/www/upload/files/nuralefekafoxapabola.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/enh91q3f4ricf3do114k9bj9c0/93403075088.pdf
    • http://webdulich.com/js/ckfinder/userfiles/files/6799182787.pdf
    • https://aquatrustfina.com/userfiles/file/73859023818.pdf
    • http://animalscipublisher.com/files/upfiles/file/babupenetixomidop.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086179bf0361---41020780854.pdf
    • https://baoholaodong24.com/userfiles/file/80684892962.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608430cb1d898---90411298130.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16097f3f16d12d---mewajafolenurokaba.pdf
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1e614ef7d---2823986113.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160706b28480fa---rixufi.pdf
    • http://autoshiftbid.com/fckeditor/userfiles/file/54344801698.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160b740b2222b7---28626207891.pdf
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/dfp6j9mfj2bqceujs97rdhn8tn/96419325868.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=watch+straight+outta+compton+full+movie+online+free+123movies
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e01f.bin
313f2c7127009829efcb35237c66ff1ebe44a0cd219b2818a4c28fbbd837ad7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE01F 18584 bytes
font_01_sfnt_off00010f7a.bin
00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7A 16140 bytes
font_02_sfnt_off000124f7.bin
1ed7edfb76763d5488f3a1e55287403ad1ea07b4f589764d072020a0358e892c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124F7 11428 bytes
font_03_sfnt_off00013ff8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13FF8 16792 bytes

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