Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f3f23b4093bdd86…

MALICIOUS

PDF

91.3 KB Created: 2021-07-02 23:35:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 61cc703b180433e4822d5e6270caaab0 SHA-1: b176b54c7368b207670383a8397ceb5054fb3478 SHA-256: 9f3f23b4093bdd86946d2f6a942224bb350e54b7a1950d5d214a2440841b6ccb
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various domains, many of which appear to be compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic findings clearly point to a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 http://reutlinger.pl/userfiles/file/volijavoragegufarigivoje.pdf
    • https://pfhotel.gr/ckfinder/userfiles/files/xewuna.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/b5c87f010f14747a40a394ac73ee7e1d/witabopigoped.pdf
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/54400750592.pdf
    • http://jnnycc.org/userfiles/file/giwer.pdf
    • http://greenreunion.org/clients/f/fd/fd69eab1634eeea6368acebbe5d5cb0d/File/jilufojik.pdf
    • https://faceless.me/userfiles/files/60872323802.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df27188282---naxebaromebowa.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/ha1c2k8tv85fmdpbivm0qh1i1f/munijapusaduvusiratigor.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160ab836b1f0a9---jiwavogewemunu.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a35a1f33d---48471031327.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a95b898bfee---riwitawajafokonotakuxa.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dde118a81d---60729534389.pdf
    • http://orgue-chantepie.info/FCKeditor/upload/file/juxivevozobimo.pdf
    • http://portalcom-b2b.es/img/user///file/_0421463001623620709.pdf
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/lufusofedojaputikuvoguf.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/08aa70e2f553e437ac70865ff5afd178/36122747482.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fbac53a75---bonaviki.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8ea919672---tozexakeberoxerosumajex.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3963ae4f7---32333433009.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/3f899f17951746e2cb5395ca5e4bba7c/66669253609.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/05b278a26676c4eb3f0e5131682921ee/tometi.pdf
    • http://computerdoki.hu/user/file/52267390091.pdf
    • http://kythuatviet.vn/uploads/userfiles/file/bupanazivawipula.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608866197d624---xokup.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=in+behalf+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9c2.bin
69b0f131ce5a2dc75620994f1c15f58f2c3ccb4f5c47c0ca2ed7d049b0f0513a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C2 17800 bytes
font_01_sfnt_off000117c1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117C1 16792 bytes
font_02_sfnt_off00012fd8.bin
1b5bfdd45ffc222845c5b39192511594ad91ecce6edf3f5c3abdcc40ebd5fa3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD8 10264 bytes
font_03_sfnt_off0001469c.bin
e896d0c9c6509c93731645541c0836c845742b74f7fde2e8ff5e94baacc6a6a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1469C 16632 bytes

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