Malicious PDF — malware analysis report

Static analysis result for SHA-256 39bcaadd38b64882…

MALICIOUS

PDF

84.6 KB Created: 2021-07-15 17:08:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7c0b0b4f3cfdf12fd3a7f6117361f583 SHA-1: 55736d98f7d75eb44dabaca03aac26941e6e7b19 SHA-256: 39bcaadd38b648826f8ecaa346e88bbfe912e188f420b8917f237ac40e8ba3c9
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which point to compromised WordPress sites hosting other PDF files. The ML classifier strongly indicates maliciousness. While no scripts were extracted, the presence of a link farm on compromised CMS uploads suggests an attempt to distribute further malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/e1b8e9652a0e570114c6f2cc48a0bd7d/melofenalufawabepaxo.pdf
    • https://fokusmedia.com/images/uploads/zupakejokaw.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076cc5453689---94895170470.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a776460d904---zamunudupevoroziruwu.pdf
    • https://tiklatakip.com/calisma2/files/uploads/jovojotire.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/sokn4esigf8g1n472fqfgmb1mp/74689455349.pdf
    • http://rajskiewakacje.pl/userfiles/file/zowidomeligekizudidusudo.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/c62c5772b9d0f65861e3a4938926206c/66484949665.pdf
    • http://www.mediagrand.hu//data/editorfile/37075340514.pdf
    • https://lukili.ch/UserFiles/files/59314677343.pdf
    • https://btcauction.vn/hinhanh/file/21404876840.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/4p33vvq7oihm3u53017qgksnv9/zikusojijirapimeko.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/302f48a85e3d276133882f975cc8c931/tozilivapezusode.pdf
    • https://pima-alarms.net/slicice/file/duwigakenolesijedojap.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/11621e3aecf0d4e804e0505fac23a00a/xisaguvabokilazapiboxeru.pdf
    • http://casinodanmarkjackpot.dk/userfiles/file/wosajiduduwuraxa.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a702535a149---36417351107.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea4c97dc1c---vorarojujazavavesesolap.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/iqjbjv6ngbuivs7q8lbm3lh8pn/19104778317.pdf
    • https://tekartltd.com/upload/files/wunoromenejika.pdf
    • https://bjsteelvietnam.com/upload/fck/file/62826410961.pdf
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/97523200201.pdf
    • http://cautrucpalang.vn/webroot/img/files/61466889832.pdf
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/juvefoforalobamameda.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b40414e297---pejetilemawevupo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=can+you+pay+your+tithes+at+any+church
    • 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_off0000ea5d.bin
c15a126daa10ba106dcc4c2772945a0b22c197a30fd3c4e2b5ec85cc0ee9f501
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5D 10672 bytes
font_01_sfnt_off000102dc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x102DC 16792 bytes
font_02_sfnt_off00011aee.bin
fd9e24319809643fe46487e28ab5df8320e4c0e966bcde2c080c4974daa23b27
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AEE 16268 bytes