Malicious PDF — malware analysis report

Static analysis result for SHA-256 b673042be1b2ec0e…

MALICIOUS

PDF

97.6 KB Created: 2021-07-01 20:07:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4e8f93cfcebb985badb3a9d690ce859f SHA-1: ba645aab74c762fdd4b0f1698f13b6116a5bb85d SHA-256: b673042be1b2ec0e9db455fbae81df8124703beca4765de3a600e7d02dadfc15
176 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous links pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The 'SE_CALLBACK_LURE' heuristic suggests a potential callback phishing or tech-support scam pretext, although the document body itself is unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/2b24d52a605a0f3ede314cfb5c4734ce/levununogezuvekit.pdf
    • http://bjhtdszdh.com/v15/Upload/file/20215141038475999.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/6129902da9e7f1e62281e968878c02ff/25576205066.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7dfa77349c---76637562097.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ab51ea4b226---vamadovebafeluj.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608af3a252bb0---lofewuru.pdf
    • http://maxtarget.by/ckfinder/userfiles/files/84733850384.pdf
    • http://oryginalnedekoracje.pl/userfiles/file/81675121383.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/it05vfadmicq7fs8h9f3pt1tv8/50883346711.pdf
    • https://irisapp.cn/uploadfiles/fckeditor/20210518/file/16212918152738.pdf
    • http://mai-colle.jp/userfiles/file/vosot.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e661e67334---kajotufexatidizamota.pdf
    • https://chmelo.hu/sites/default/files/file/6900265057.pdf
    • http://wallsfamilyreunion.com/clients/876683/File/lewikowe.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe4e0ecf81---66620322610.pdf
    • http://starwindows.ie/ckfinder/userfiles/files/12665501670.pdf
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071680814ce6---40897075868.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607709428c010---gexorivopira.pdf
    • http://learningkey.org/userfiles/fuxevajeditejiwe.pdf
    • http://andrelandberg.com/userfiles/file/35866536390.pdf
    • http://brooklynsmokeshops.com/admin/images/file/45389789321.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/0964d8620e4ebb1a54eb6bfd9a7d400c/merelazatofewomupenal.pdf
    • http://acril.ru/ufiles/files/nufepuromoxi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=ostensible+meaning+in+english
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00013d4d.bin
db0e844b2a885c0b659b6a1c0b3d90ee0d34d17ad3232b00ca1aa0eb48781ca9
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13D4D 19604 bytes
font_00_sfnt_off0000da4a.bin
a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4A 3464 bytes
font_01_sfnt_off0000e7c5.bin
8e4e9919c48da62b788dab1ea7eb78536425e30136e2390b2787c913eefdb2c6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C5 24844 bytes
font_02_sfnt_off0001253c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1253C 16792 bytes
font_04_sfnt_off00015ed3.bin
0afe019da31aa65d7d75ad503533b63751061fdf5d008d981a7177991876e95b
pdf-font-stream PDF embedded font (sfnt) at offset 0x15ED3 10500 bytes