Malicious PDF — malware analysis report

Static analysis result for SHA-256 60130d7182ca706c…

MALICIOUS

PDF

82.7 KB Created: 2021-09-17 10:36:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c14834b3971d5a8385d5fcdf9293c78f SHA-1: 98fdaad55620c2d8692e5631cc29af4b545f50bb SHA-256: 60130d7182ca706c12a76e500c4cd97bc3ccade2371226b4d56cebf075c71c56
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The 'SE_CALLBACK_LURE' heuristic strongly suggests the document's content is a pretext for a callback phishing or tech-support scam, aiming to trick users into calling a fraudulent phone number. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • 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 https://philabc.ru/uplcv?utm_term=how+do+you+write+in+care+of+on+an+envelope PDF link annotation
    • https://flims.atelierleuthold.ch/userfiles/files/wasuroxu.pdfIn PDF document text
    • https://cncunse.com/d/files/25420409929.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/caca8bfaf3b3e1cb4a462122ff3bd70f/97808509890.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/ditutesupenutewabizidu.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/lugomewaxidamiwevesusix.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/rigowexolodifitod.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/mgjpq15l4912372446af207if5/soviwojipupiwomujaforobo.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/54127617237.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/dabotesotuzakekorovuwizan.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/61295033870.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139575d15905---rukobemaw.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/dezabelem.pdfIn PDF document text
    • https://u15.ch/ckfinder/userfiles/files/91644632663.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/wafovatij.pdfIn PDF document text
    • http://emekyesiltepe.net/images_upload/files/luluwedafezapeturaj.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/lh408fmicsolgrfqc8mge765s2/mafomixo.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/vamixeferiruwonutarinux.pdfIn PDF document text
    • http://cermak-expo.cz/data/files/file/zafekiliwenogofiganalas.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e31a25d17f---2615893372.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613eceeda6ab6---koxanigejowonadorifuwe.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210910173807_NzYwNTI3OTMyMjg=.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/42789819332.pdfIn PDF document text
    • https://institutdesante.org/userfiles/file/divibage.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/2af4878442ddec7c1c3eb8ca8e1212d5/nopoxez.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/nosetabezuvidod.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/tesezalaxixelavijazet.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/duvuguvadepi.pdfIn PDF document text
    • http://ildong.org/sa_upload/userfiles/file/20210913001705.pdfIn PDF document text
    • 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_off0000de61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE61 17388 bytes
SHA-256: 3623d940d1e0aa5a2f59b8802dbe584066d18ad64c71e5bb7e9365e1eed8104e
font_01_sfnt_off00010b32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B32 10800 bytes
SHA-256: 9b69590f1f320977fb902e925945e4ed771d3e5889c7cd93369799062985cd91
font_02_sfnt_off0001243b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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