Malicious PDF — malware analysis report

Static analysis result for SHA-256 93d2a55ced6cc35d…

MALICIOUS

PDF

85.6 KB Created: 2021-09-01 18:24:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: afecc0be8d3b3d440bbe11bb9145f453 SHA-1: f1203fa82f311d86911b385e3241a86c469a9ff7 SHA-256: 93d2a55ced6cc35dce88c9206454bd4846db308925849a86d5d164e1c0b6f1e2
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish for information. No scripts were extracted, but the structure and URL patterns strongly indicate a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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 https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/2bd8297937e3c51514e3c2ca13f028d7/99759943380.pdf In PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16112572cb31fe---84230722742.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/99960699868.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/rs0om3ulbepdokn4ogb0oddg6j/ridufemux.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/buzubozowuwinum.pdfIn PDF document text
    • http://pasted-radio.de/web/files/gizewidibabapopixazom.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/gutuxotevaxap.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ee7c73d1915---fefagexezaduxuxopag.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/676e43fe60ec202b87448760e946f389/fepijiluduxesadobuk.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/kc8vie6q8ggnu6ltm9l7s1a7v7/fuwejinuxifomoxuj.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/04b69cc9c2deee5dad6c53a35873aab5/38551633843.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e9361e8840f---sijevuvu.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1625763463.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210809_AD7487933DF3B1CB.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/9a2699d5992c96108c455994dfff99d3/pefizuveropazobesikef.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/vuvaxifanejiwiba.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/fcm9c3k9ftf42krvf2g1ra4h86/47729710946.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/gilewivej.pdfIn PDF document text
    • http://kasystemofkarate.com/clients/861259/File/gutukipol.pdfIn PDF document text
    • http://alltechsro.cz/files/xeloxafe.pdfIn PDF document text
    • https://edinburghpools.com/contents//files/10981459486.pdfIn PDF document text
    • http://absigorta.com/E/file/garibipovunekagi.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/155303331760f08dda663f1.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/buputokeduxuj.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/dctl93eueudu0ka5rckgra4av0/tusisenedejerezajumimad.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/josujafuwizelojopixu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=worms+in+bum+at+nightPDF 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_off0000e784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE784 18536 bytes
SHA-256: 0f5f4e50897201c519c7e4702b9edd2aef42d3640db722aeee7f611c47c95a04
font_01_sfnt_off000117aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AA 10608 bytes
SHA-256: 781b1260166582151f972572e2b2894663d4cf5bd8726e6bb34e9c328efce940
font_02_sfnt_off00012fc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1