Malicious PDF — malware analysis report

Static analysis result for SHA-256 83b622fe53f28196…

MALICIOUS

PDF

255.4 KB Created: 2021-07-07 08:58:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8d9233f8f1cbe1b502487e04c4a06601 SHA-1: a02a1d41a71e0143c5b46f2a0721e8fec787a848 SHA-256: 83b622fe53f281966fe915a37c59dc6465f8602b257e6ccd1e10d6143743fb4d
166 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of an advance-fee scam. It contains numerous links pointing to compromised WordPress upload storage, suggesting it's part of a campaign to distribute malicious PDFs. The document body is heavily obfuscated, preventing a detailed analysis of its specific lure, but the presence of multiple suspicious URLs indicates a high likelihood of payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9783

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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.
  • 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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2bd0a41926---4992102056.pdf
    • http://charivne.info/images/file/39631465556.pdf
    • http://studiotecnicomaglio.it/userfiles/files/jajijanedodedebavopes.pdf
    • https://101doctor.com/uploads/ckfiles/files/60bb446d179b9.pdf
    • http://logistra.fr/ressource/site-image/files/66706975931.pdf
    • http://zabradli-znerezu.cz/userfiles/file/lexin.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16082a576c4890---2920079443.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/56191dbeb1ddfc72347c1dd66ccd1432/tezesosegeveretexenepa.pdf
    • https://sailstudy.in/ckfinder/userfiles/files/11937184551.pdf
    • http://conblocmanado.com/pics/file/33862892611.pdf
    • https://galedo.cz/www/data/cms_files/files/95765092456.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773d8612db0---bewazejotiki.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/cnae1bknoc78h19ccsvm9q1qbg/28747857602.pdf
    • http://xaydungphongphu.com/uploads/files/biwatimod.pdf
    • https://ludifrance.fr/userfiles/file/79360862924.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c160bb6d20b---47416985687.pdf
    • https://majorsagilekvaros.hu/uploads/file/10884555165.pdf
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/48863618279.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/53f91c40a80ccb4f78b060c93b1f3830/resalisizezekazukani.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087f497cce65---7809831730.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/43e502d2526db88898404cc74e06acc0/63425471550.pdf
    • http://pokemom2.com/uploads/files/gumaxos.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982ec7b62ad---37930582062.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085d5dac9982---81284276481.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/f13bf80fb6c398eca9f6e06c43783f58/kipimarojelekabikodu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=an+introduction+to+human+factors+engineering+3rd+edition+pdf+free
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000389e0.bin
1b2c109ff8be24a0d17bce9ba6b39e493b36b7d5b5577e67a292160efe0b3c75
pdf-font-stream PDF embedded font (sfnt) at offset 0x389E0 18512 bytes
font_01_sfnt_off0003ba97.bin
f40ba4fabe700082feee1daeffb15e5acbe4dbb1f76f8a69605d6e44824dbd08
pdf-font-stream PDF embedded font (sfnt) at offset 0x3BA97 11276 bytes
font_02_sfnt_off0003d4c4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x3D4C4 16792 bytes