Malicious PDF — malware analysis report

Static analysis result for SHA-256 003e3850d57dc837…

MALICIOUS

PDF

80.3 KB Created: 2021-06-30 20:10:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 483d7c72d715d1ace4ef3045e3c4e511 SHA-1: 43d5a410491b7f7bf1c3fece5e9855faa089b207 SHA-256: 003e3850d57dc83744c5a13e14f471829092c650410a4e50820a1c9cadde175f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs pointing to link farms hosted on compromised WordPress sites. These link farms likely serve as a distribution point for malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent.

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
  • 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://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088d50111163---tuxavemutatikeso.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/0e7j0cl5lvl6aeatmn19tnqak1/gusowuwizabibezezus.pdf
    • https://atphp.ch/userfiles/file/19370242365.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1608a212e8f261---torokenuvoxomubikofuze.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/e229b990e365d27f82b6eca925965f8c/jekigelujidelo.pdf
    • http://ozanatalan.com/iboard/includes/userfiles/files/3681343660.pdf
    • http://fouladsazanco.com/Upload/file/66022427115.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e2c2cb51e---xikunagakav.pdf
    • https://tenekedjieva.com/uploads/file/28119905535.pdf
    • http://garagehayashi.com/js/upload/files/57227256181.pdf
    • http://sns-russia.ru/userfiles/file/60788581880.pdf
    • https://thediamangroup.com/_images/files/mopigisenu.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/2c8e45f22723f6b4d15206086d5598b2/11463784413.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/668141e4357c7b6f1a6924f1ba6b0c7a/24876563012.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c002625ce39---66046315775.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160abed21b3deb---60215781077.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/pcsvf58ggivlv71t3p4i0mbume/68556659419.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160914c0041c8c---wudugusumatu.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16088322fe38cd---rezowuxozifagavupik.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c45de2d271---34597994073.pdf
    • http://brooklynsmokeshops.com/admin/images/file/85321488393.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/u53situltcnpi2dhi41ke0bjlg/bikijunefagozigufififagu.pdf
    • http://dmscsmartlifeblog.com/userfiles/files/30517754213.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b29a93203d7---51409549346.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=pride+tagalog+meaning
    • 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_off0000d651.bin
ca6aff0e460fe0824f565ed91174df99f44c4276b19ff918ae3a6324cdbf9960
pdf-font-stream PDF embedded font (sfnt) at offset 0xD651 10424 bytes
font_01_sfnt_off0000eda2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA2 16792 bytes
font_02_sfnt_off000105b4.bin
cff50c2333c4716f204d6dd5a4e04b7920f8d179cba6483429ade776bd574deb
pdf-font-stream PDF embedded font (sfnt) at offset 0x105B4 17216 bytes