Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cb65a866a3c8c2c…

MALICIOUS

PDF

89.1 KB Created: 2021-07-03 06:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8d06071fdf1428fbf941d795dae7ec32 SHA-1: ba78f88a2ce0631cab735218bc6f5d1a0511302c SHA-256: 7cb65a866a3c8c2c57d29d533a2ada69a29a5e3d66229750bbaf03d275188866
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_CALLBACK_LURE' heuristic suggests the document is designed to trick users into calling a phone number, a common tactic in phishing and tech-support scams. While no scripts were explicitly extracted, the presence of numerous links to potentially compromised CMS upload directories and disposable hosting points to a distribution mechanism for malicious content, likely involving embedded JavaScript or other exploits within the PDF structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/d56d592f70672faa0145b259390b6031/86122916292.pdf In PDF document text
    • http://immobilieninvestors.eu/userfiles/file/68956843955.pdfIn PDF document text
    • http://flatadministration.com/uploades/fckeditorfile/99586147909.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/31352164154.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c70f8bc89---degejurero.pdfIn PDF document text
    • https://valdisieveshopping.it/file/kodorojixeretes.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/49308084544.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/3eg0osulb1eev2n0ge04h9maqt/gevelene.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/21974933633.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/5g804gam2uk9u8khn3llfnnah0/wetojaveb.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/t2ftmbb1ppvumofnhv23p9hlm0/5340672200.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608941d683488---23148635196.pdfIn PDF document text
    • http://hhsbluebirds1967.com/clients/b/b5/b592d679e9980e62d9d56be1bfb8b6b6/File/wugixupoxasar.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/vdt3cr2jqsm4c2kp5h1rec0b7c/73583059657.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/761720416.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/3ac5ae0f435623000380339858ee028b/deromidowenenedulote.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/31297567349.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/wanakosazukisazuviju.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2f43a5e34a---19297967774.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/digudokowat.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/04d86348af90e03c652208a323fa1c09/dolonoxufodutep.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a560642c7fc---14030998508.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c9462e6e8ba---wisumexopomakusip.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc849bb751---makobevibijanad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=ground+state+term+symbol+for+d7PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCF 10868 bytes
SHA-256: 3c3b580311b2b979496c281269eea9660be440bbe6b07db2eeab4ab7f638de2e
font_02_sfnt_off00012607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12607 18480 bytes
SHA-256: 5c4705c7369c5b34591ec3319fb7a87848ffd5055c48f9c83e6f13ce1e97d2d0

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