Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d0bd63af5ef87d4…

MALICIOUS

PDF

90.8 KB Created: 2021-08-20 17:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 115d46c22041040e025cef4c8522afda SHA-1: 1b1267638a0755177f3e5f178c76810bb64866e8 SHA-256: 1d0bd63af5ef87d4f98b70b743815b9dd0b363ebbd8efe46f500ec91db63a121
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm. Multiple URLs point to PDF files hosted on various domains, some of which appear to be compromised CMS upload directories. This suggests the document is designed to lure users into downloading further malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://baraanduliaptti.org/userfiles/file/fofogu.pdf In PDF document text
    • http://headlinesdinerla.com/uploads/files/34113046313.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/3f7c7aa3247020ab6fe6fa8f0b3396e2/genemo.pdfIn PDF document text
    • https://ecole-anglais.com/upload/files/60650552265.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/siluvezomodefozumutumuk.pdfIn PDF document text
    • http://reflita.lt/uploads/files/xelabotuxamekiterup.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/89649919739.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/69274894971.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/putolavuwu.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/c0bef812c010996201c78f83b85adae0/62878227761.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/56ab1277e7895a2847215f6180f597d5/zetizozotemenetefep.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/vinupufubonasasef.pdfIn PDF document text
    • http://mav-auto.ru/images/file/vowak.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/ce0753c2cbc7bad16659e9c433856466/wubofona.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/268b71f98923846bfa5bfcf76409dfb5/19985057310.pdfIn PDF document text
    • https://curryleafharleysvillepa.com/hang/userfiles/files/49647042693.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/goraxemobavu.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/98908d5ef4310f0eaa39bebb6700b750/99343782355.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-6///2021622042225358.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/302bdec85716efea957c2cfaeeaedf71/60844093476.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108a9807f6a2---kotokuvama.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d30ed858c---33732566799.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/d9c5a7e9b052bef5004574dd8b567435/38227153158.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/3a9ab209d09e6b115b972163e4e511ef/zadowikejeradevijot.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/vesiremolenul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+improve+continuous+process+improvementsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E6 16524 bytes
SHA-256: fce1394a89fc92f08925939d20d3a36742c397202fa976ed987d9178f4a1938f
font_01_sfnt_off0000fe1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11633 10572 bytes
SHA-256: 24f85fcdaa9ad2ffd5c9534554c7edcd8b7a05396730c237b96c2eac840ba25b
font_03_sfnt_off00012e59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E59 18320 bytes
SHA-256: 8ad12f31d38f3c5050ee6947fc5fa529f791646c1b724cf3ca0cb811a1652a10

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